Dirt is like thousands of little blades that cut carpet fibers. Walking across a dirty carpet, you grind sharp dirt particles against the yarn, making tiny nicks in the fibers. All that fuzz mixed in with the dirt in your vacuum cleaner bags is your beautiful carpet headed out the door one bag at a time.

When dirt scratches the fibers, it dulls the carpet’s sheen, which is why high-traffic areas appear duller than the rest of the carpet. Over time, grinding dirt wears away the fibers, too, matting them down and making them stain more easily. Follow these tips on how to clean and disinfect carpet to keep yours as dirt-free as possible.

Also, learn how to remove wrinkles in carpeting.

Banish Dirt

Vacuum often

To protect your carpet, vacuum entrance areas and high-traffic areas twice a week and the rest of the carpeting at least weekly. (Before you do that, use a carpet rake to break up the gunk so your vacuum can finish the job perfectly.) Oily soils attract oily soils, and frequent vacuuming will reduce soil buildup.

Start with a clean bag or filter

A dirty bag, dirt cup or filter can cut a vacuum’s suction power in half. The main reason bagless vacuums stop working is that the filters aren’t changed often enough. Replace or wash (if possible) the filters on bagless vacuums every three months. Replace vacuum bags when they’re three-quarters full.

Vacuum at the right speed

Vacuum slowly enough to get out as much dirt as possible. Make one quick pass over low-traffic areas and two slow passes over high-traffic areas. Two slow passes remove ground-in dirt more effectively than several fast passes.

Use walk-off mats

Clean door mat on wooden floor in hallLIUDMILA CHERNETSKA/GETTY IMAGES

Use walk-off mats inside and out to keep dirt off the carpeting. Coarse-textured mats outside your doors remove soil and will make carpet cleaning easier down the line. Water-absorbent mats inside the doorway keep wet shoes off of the carpeting.

Use a Pro Wisely

Most carpet manufacturers recommend professional hot water extraction as the primary cleaning method for synthetic carpets. Although it’s often referred to as “steam” cleaning, there’s no steam involved. The carpet is pretreated with a detergent solution, and then a very hot rinse solution is forced into it and vacuumed out under high pressure. When done correctly, this process cleans deep and doesn’t leave behind a soap residue.

A rented or purchased carpet-cleaning machine will remove the surface dirt. But deep cleaning to remove allergens, dust and greasy residues requires the specialized equipment and training of a pro.

The best strategy is to use our DIY how-to-clean carpet cleaning tips most of the time and hire a professional every 12 to 18 months.

Don’t take bids over the phone

Quality pros will provide references, an in-home inspection and a written estimate based on the square footage, type and condition of the carpeting rather than the number of rooms cleaned, and a written guarantee of their work.

Beware of “discount” carpet cleaners

Discount pros depend on making volume sales rather than establishing ongoing client relationships. They typically spray soap on your carpet, suck up the water and are gone in 30 minutes. These services leave behind a soap residue that will actually attract dirt to your carpet. Those “three rooms for 50 bucks” offers also get them into your house so they can sell you high-priced add-ons like spot removal and deodorizers—services that quality pros include for free.

You get what you pay for

Quality pros charge according to the type of carpeting, the services you need and the job size. The entire process can take one to three hours.

DIY Right

A steam cleaner in action cleaning a carpetSNYFEROK/GETTY IMAGES

Carpet pros do a more thorough job than you can, but hiring a pro is expensive. The next-best approach is to alternate between DIY and professional cleanings. DIY “steam” cleaning machines can be effective if you understand how to use them and take the time to clean your carpet carefully.

You can rent a steam cleaner from a grocery store or home center. If you pick the machine up late in the day, many stores will charge you a half-day rate and let you keep the machine until the next morning. The detergent cost is additional. Typically, you should use a tablespoon or less per gallon of water.

If you prefer to buy a steam-cleaning machine, plan to spend $60 to $300 or more. The pricier models have more powerful water jets and suction; some even have a heating element to keep the water hot. The reviews on these machines are mixed, and some are prone to breakdowns. Do online research (type “carpet cleaning machines” into your browser) before buying.

Most rental machines weigh more, hold more water and come with a wider wand than purchased models, making them useful for larger, high-traffic areas. Purchased models are usually smaller, more portable and easier to store. They’re good for spot cleaning and are easier to drag up and down stairs.

Clean the carpet before it becomes really dirty

How often your carpet needs cleaning depends on the kind of carpet traffic you have (think kids and pets). Clean the carpet when the color starts looking dull. If you wait until the carpet is filthy, cleaning it will be much more difficult, take much longer and cost more.

Vacuum well before and after cleaning

Vacuum beforehand to remove large particles of soil. Vacuum again after you clean and the carpet is completely dry to pick up soil that wicks to the surface during drying.

Pretreat stains and high-traffic areas

Mix a drop of detergent with hot water in a spray bottle and lightly mist the dirtiest areas. Let sit 5 to 10 minutes before starting the general cleaning. Learn how to get wax out of your carpet.

Remove or elevate furniture

If your furniture is too heavy to move, put aluminum foil squares, wood blocks or plastic film under and around the legs of all furniture to prevent rust from metal casters or stains from paint and finishes from transferring to damp carpet.

Don’t overwet the carpet

DIY machines put a lot of moisture into the carpet, and most don’t have strong enough suction to extract it thoroughly. Make only one pass with the soap and water solution. Make one pass with the neutralizing rinse solution. Then, make two or three drying passes with the water off.

Let it dry thoroughly

Wet carpets are perfect environments for mold and mildew. After you clean your carpets, open the windows, use fans and a dehumidifier, or put the AC on a moderate setting (72 to 78 degrees) to remove excess moisture from the air. Don’t replace the furniture or walk on the carpet until it’s completely dry. This can take up to 12 hours, though six to eight hours is typical.

Clean Stains Right Away

Don’t dig or scoop food spills

Someone picking spilled food from carpet with spoonTMB Studio

Digging or scooping can work the stain into the carpet. If there are solids on top of the stain, use a spoon or dull knife to carefully scrape the food toward the middle of the spill and into a white towel, then treat the stain.

Use a shop vacuum on wet spills

Using Shop vacuum to remove stains from carpetTMB Studio

Keep vacuuming until no more liquid can be removed. If the spill was a colored liquid, treat it like a stain after vacuuming.

Act quickly

If you get to a stain immediately, there’s a 99 percent chance you can remove it. The longer a stain reacts chemically with the carpeting, the harder it is to remove.

Try water first

Eighty percent of stains can be removed using plain tap water. To remove a stain, press a clean, dry, white cloth over the stain to absorb the spill. Repeat until the spill is absorbed. Then, gently work water into the stain with a damp white towel and blot until the stain is gone. Change out the cleaning cloths when necessary. For a particularly stubborn spot, go to the online “spot solver” resource at The Carpet and Rug Institute (the carpet manufacturers’ trade organization) to find your stain and a suggested solution. Use a fan to dry the area if it’s very wet.

Blot—don’t rub or scrub

Scrubbing a stain will damage the fibers and create a fuzzy area. Always blot from the outer edge toward the center of the stain to avoid spreading the spot and creating a larger problem.

Be patient

Work water gently into the spill and then blot with a dry cloth. Repeat until the stain is gone and all the water has been absorbed. If you’re patient, you’ll almost always be able to remove the stain.

On tough spots, try vinegar or club soda

If water alone doesn’t remove a stain, try a white vinegar and water solution (equal amounts) or club soda before trying stronger commercial cleaning products.

Test commercial products first

Some products can cause the carpet to get dirty faster or damage the carpet’s color and texture. For a list of carpet manufacturer-approved spot and stain cleaners, go online to The Carpet and Rug Institute. Test carpet-cleaning products on an inconspicuous area before using.