Our Picks
If you're gearing up to do some spring cleaning, don't forget about the carpets. Your carpets experience a lot of wear and tear from being constantly walked on. They can quickly get dirty with mold, dirt, allergens, pet dander, hair and outdoor pollutants that latch onto their fibers. Vacuum cleaners alone can't always tackle all of these messes. Hiring a professional carpet cleaner is one way to remove stains and dirt, but if you prefer a DIY approach, buying an excellent carpet cleaning machine can be an affordable and practical alternative.
Every once in a while, you'll want to get the contaminants out by shampooing your carpets as well. A freshly shampooed carpet brings life back into your floors, especially if you're removing food spills, dirt or pet stains.
To help you get your carpets looking fresh and clean, we tested seven of the most popular cleaning machines on the market to find the carpet cleaners worth investing in for your home.
We put these upright carpet cleaners through our extensive testing procedure, which combines basic principles of physics with abundant patience. Let's look at some laboratory equipment and how we uncovered the results.
What is the best carpet cleaner?
Not enough good things can be said about the Hoover Power Scrub carpet cleaner. True to its name, it boasts SpinScrub technology with five circular, rotary brushes that proved to be remarkably efficient at removing debris and stains from our white carpet. Unsurprisingly, this unit outperformed its competition in every category, achieving impressive cleaning efficiency scores of 59.2%, 46.2%, and 30.4% for the red wine stain, coffee stain and motor oil stain, respectively.
Equipped with a 6-inch stair tool, 3-inch upholstery tool, 4-inch crevice tool and one SpinScrub hand tool, a separate dirty water tank, along with trial formulas, a removable nozzle piece and brushes for quick cleaning and replacement, the Hoover Power Scrub offers exceptional versatility. Its two cleaning modes, Wash and Rinse, proved to be particularly handy during our tough mess test, earning it second place in this category with a cleaning score of 68.8.
What makes this unit even more appealing is its affordability. Currently priced at $150 on Amazon, it is the cheapest unit on the list. Despite its budget-friendly price, the Hoover Power Scrub delivers powerful cleaning performance and comes with nifty attachments to tackle those hard-to-reach spots. With all these features combined, it's no surprise that the Hoover Power Scrub emerges as our clear winner.
Clean wet or dry with one machine
iRobot Roomba Combo i5+ Self-Emptying Robot Vacuum & Mop
Whether your mess is wet or dry, the Roomba Combo i5+ robot vacuum and mop can double up on cleaning tasks with one machine. From spilled crackers to everyday shoe prints -- this robot can handle it. Set it to vacuum only or to vacuum and mop your hard floors by swapping in the Roomba Combo Bin.
Double the clean with one machine. The Roomba Combo i5+ robot vacuum and mop is designed for both wet and dry floor cleaning, converting from an all-floor vacuum to a hard floor vacuum and mop with the simple switch of a bin.
Powerful performance. Powerful pickup. Pulls in the everyday dirt and debris with its 4-Stage Cleaning System, featuring unique Dual Multi-Surface Rubber Brushes that adjust to different floor types and avoid getting tangled with pet hair.
Automatically cleans up after itself, emptying its vacuum bin into an enclosed bag that holds up to 60 days of debris, which means two whole months of not thinking about vacuuming.
Simultaneously vacuum and mop hard floors. Don't waste extra time cleaning: The Roomba Combo i5+ robot vacuum and mop cleans wet or dry with one machine.
The Hoover Smartwash Pet Complete retails for $320 and proved to be a reliable cleaner in our tests. With decent cleaning efficiency scores of 42.7%, 32.0% and 14.5% for wine, coffee and motor oil stains, respectively, it gets the job done. More notably, it excelled in our tough mess test, achieving an impressive cleaning score of 77.9.
Equipped with a variety of useful features, the Hoover Smartwash Pet Complete ensures a thorough cleaning experience. It includes an antimicrobial pet tool, a dirty water tank separate from the clean water, a removable pretreat wand, a 6-inch stair cleaning tool, removable FlexForce PowerBrushes and two trial cleaning formula containers. The pretreat wand, holding a pretreat solution tank, features a triggerless handle design that simplifies the process of pretreating pet stains and otherwise dirty carpets with precision.
One standout feature of this unit is its buttonless cleaning modes. Just go forward to dispense carpet shampoo (wet stroke) and go backward to dry only (dry stroke). This convenient functionality streamlines spot cleaning, eliminating the need for manual switching between cleaning and drying modes. Don't forget to activate its "dry only" mode to remove excess water for optimal results. The Hoover Smartwash Pet Complete is a solid choice for pet owners looking to remove pet stains or dander and anyone seeking an efficient and hassle-free carpet cleaning experience.
Priced at $375 at the time of this post, the Bissell ProHeat 2X Lift-Off may fall on the pricier side, but it more than compensates with its excellent cleaning performance and impressive versatility. In our stain removal test, the Bissell ProHeat 2X achieved solid cleaning scores of 58%, 25% and 30% for red wine, coffee and motor oil stains, respectively. Moreover, it passed our tough stain test with a cleaning score of 60.6.
The Bissell ProHeat 2X Lift-Off comes with a 3-inch Tough Stain Tool and two trial formulas, and the best part is that it can easily transform into a portable carpet cleaner. As the name suggests, you can lift off the water/solution tank from the rest of the machine, attach the aforementioned Tough Stain Tool via an included hose, and take its cleaning power wherever it's needed. This feature comes in particularly handy if you're seeking an efficient machine to get a clean carpet and also allows you to clean other less accessible surfaces, such as the inside of your car, stairs, crevices and living room furniture.
With its cleaning prowess and added portability, the Bissell ProHeat 2X Lift-Off proves to be a worthy investment for those looking for a versatile and powerful cleaning solution for tough stains.
How we tested carpet cleaning machines
For this experiment, I headed to CNET's product-testing laboratory in Louisville, Kentucky, where I used a reflectometer and a little bit of basic physics to assess the performance of the machines by comparing their cleaning efficiency when presented with a variety of the most common carpet staining substances.
Color
As you may recall from high school physics, color is just our brain's interpretation of visible light of different wavelengths. For instance, red corresponds to long, low-energy wavelengths around 700 nanometers, while blue and violet represent short, high-energy wavelengths, with violet having the shortest of these at only 380 nm.
The Electromagnetic Spectrum. Our eyes can only perceive the section in the middle. That's what we call visible light.
When we observe a red apple, two things are happening simultaneously; the peel of the apple is reflecting only the light of long wavelength (red) and absorbing most of the other light. Our eyes collect this information and immediately relay it to the brain for processing. This is how we can perceive color (red, in this instance) with astounding precision. You may be wondering why black and white are not part of the picture above. That's because white comprises visible light of all wavelengths combined, while black is the absence of visible light.
That's all well and good, but how does it all relate to carpet cleaner testing? Glad you asked.
Carpet cleaning efficiency test
Our eyes can tell the difference between dirty and clean carpet but how do we actually measure that difference? In theory, if we could quantify the light reflected by a carpet sample (that is, to measure its "color"), we could assess the cleaning power of each machine by taking color measurements from a brand-new piece of carpet and comparing them to measurements obtained after it's been stained and subsequently cleaned. The ratio of these two reflectivity values (before vs. after) would allow us to assess performance. In my test logic, the more similar those numbers are, the better the carpet was restored to its original color. We could repeat this procedure for every unit under test and compare the results... So yeah, that's exactly what we did.
Photovolt 5700PC Reflectometer and search unit. Inside the search unit, there's a tristimulus filter that prevents other type of light (i.e. UV and IR) from interfering with the readings, and a photo sensor that measures the amount of light reflected from the surface of the test subject -- our white carpet.
Enter the reflectometer, a device of many color-matching applications in industries like textiles and paints. Fortunately, the working principle of the reflectometer applies to our purposes, as well. Our Photovolt Model 577PC Reflectometer has a search unit or "probe" that houses a tungsten bulb that emits light in all directions within a chamber and then measures how much of that light is reflected to its photosensors. This measurement generates a voltage that is linearly correlated to the amount of reflected light perceived by the photosensor, which enables us to quantify light and color. Science.
We will use the whiteness index as our frame of reference. This parameter is used to measure how "white" a sample is by measuring its reflectance under two different light filters (blue and green) and then using an equation to correlate and normalize these values. Since we will be using a white carpet for this test, getting WI values from before and after gives us an accurate representation of how much of the soil and stain was effectively removed from our carpet by each machine.
We segmented four 6-by-6-inch "stain squares," each containing one type of soil. We placed the search unit on top of the brand-new white carpet sample and measured its WI. To ensure repeatability and accuracy, we took five readings at different locations within our soil square and averaged the reflectance readouts.
We selected four substances for staining:
- 150ml sweet red wine: A sugary, alcoholic substance with proven staining power.
- 150ml black coffee: An acidic, everyday substance containing tannin, a naturally occurring dye.
- 150ml motor oil: Our oily stain of choice. Tough to remove since it doesn't mix well with the water dispensed by the UUT.
- 60g marinara sauce: An organic, tomato-based substance that proved to be the toughest stain to remove.
Staining carpet with sweet red wine, coffee, motor oil and marinara sauce.
We proceeded to soil the squared sections, allowing the contaminants to settle for approximately one hour. Then, we began the cleaning process. Two cleaning cycles were performed on each stained square. A cleaning cycle consists of two wet strokes, followed by four dry strokes. Finally, we measured reflectivity values at the same five locations as previously and averaged them. The ratio of final vs. initial WI values tells us how efficient the carpet cleaning machine was at restoring the carpet to its original white.
Sample of stained carpet before and after it's been cleaned by a carpet cleaning machine. Notice that in all instances soil wasn't removed from carpet efficiently... Can you guess which unit this is? (Hint: It's not one of the three top picks above.)
The tough mess test
Our lab technician, Eric Snyder, accurately weighing marinara sauce for the tough mess test.
Marinara sauce proved to be the toughest type of soil to remove. Since every cleaner had such a rough time removing it from the carpet in just two passes, we thought it deserved its own category. Hence, the tough mess test.
For this challenge, we followed manufacturers' recommendations to set each cleaner to its "max" or "tough mess" setting and performed any additional cleaning steps such as pretreating with a provided chemical substance, pretreating and cleaning with steam, etc. We modified the WI equation so that it's more suitable for comparison, and we carried out the same procedure for taking color measurements and comparing the WI values.
Marinara stains are a tough, tomatoey mess.
Results
Let's keep in mind that the test has been designed to be hard. To ensure comparability, the units were only allowed to be cleaned in a limited and controlled manner. More importantly, the WI equation assumes that the sample under the reflectometer is pretty close to true white. White printer paper is 91% white, while our carpet is 55% white. It's the whitest carpet we could find, but it's not that white. Don't be surprised if the scores seem low overall.
Here's a fun fact: During this experiment, we carried out a total of 700 measurements, all to provide you with the right information for making an informed purchase decision that meets your needs. The table below summarizes the results, and remember, higher scores are better.
The results are in. Check out how different models compare to one another in terms of cleaning performance (higher scores are better).
Other carpet cleaners we've tested
Bissell Hydrosteam Pet Model 3423: I had high expectations from this model since it's one of the pricier ones out there, but it only proved capable of posting the third-lowest score in our tough mess test. Despite using steam dispensing technology for pretreating and cleaning carpets, the performance left us unimpressed.
Bissell ProHeat 2X Revolution Pet Pro Model 3587: This unit had a surprisingly high score in our tough mess test, ranking third in this category with a respectable score of 66.1. It didn't score quite as high when cleaning other stain types. It ended our tests with the third-lowest cleaning score overall. It comes with a two-in-one upholstery tool, a three-in-one stair tool, a 3-inch deep stain tool and a very convenient tray for cleaning out the unit, but we think there are better options.
Hoover Pro Clean Pet Carpet Washer(Currently out of stock): One of the least expensive models of the bunch, but its performance wasn't that great. For starters, this Hoover cleaner was the only unit to get a "fail" score in our test. In the case of marinara and motor oil, it even seemed to spread the soil along its path on the carpet, which is never good.
Bissell Crosswave Hydrosteam All-In-One Multi-Surface Cleaner 3515: This Bissell carpet cleaner was the lowest performer in both our cleaning efficiency test and tough mess test. It was very hard to push this unit along our low-pile carpet, probably because the cleaning brush roll is stopped by friction against the carpet threads. Highlights of this product include steam dispensing capability and that it can be used to clean other surfaces like wood flooring.
Keeping your carpet cleaner clean
While we like to think that our carpet cleaners are self-cleaning; they do use soap, right? In reality, these devices still need some cleaning from time to time. From hair getting tangled around the brush to dirty water tanks, there are still reasons that these cleaners need us to maintain them. By doing some regular maintenance on your carpet cleaner, it will continue to perform well for years to come.
Some of the routine cleaning that needs to be done for your carpet cleaner is done after each use, while other stuff can be done weekly or even monthly, depending on how frequently you use your cleaner.
- Daily: Emptying and rinsing the dirty water tank and checking wheels for stuck debris.
- Weekly: Cleaning brush rolls and wheels.
- Monthly: Clean hose and attachments if used; remove and deep clean the brushes.
Most of this work will take only a few minutes at most, and your carpet cleaner will be able to perform at its peak. Leaving you with a much cleaner house in return.