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Your carpet cleaner scrubs pet stains, spilled coffee, and muddy footprints out of your carpet — but who cleans the cleaner? A dirty machine leaves a sour, mildewy smell in your carpet, sprays gray water instead of clean solution, and slowly loses suction until it barely works. Deep cleaning your carpet cleaner takes about 30 minutes and restores it to like-new performance.
This guide covers portable spot cleaners (like the BISSELL Little Green) and full-size upright carpet cleaners, step by step.
Why Your Carpet Cleaner Needs Deep Cleaning
Every time you clean carpet, the machine sucks up dirty water, dissolved detergent, pet dander, and hair into its tanks, hoses, and filters. Leftovers ferment. Within a few weeks of regular use, three things happen:
- Odor. Bacteria grow in the dirty-water tank and hose, producing the classic “wet dog” smell that transfers back to your carpet.
- Lost suction. Hair and grit clog the hose, the nozzle, and the filter, reducing airflow.
- Streaky results. Old detergent residue in the clean-water tank leaves sticky residue that attracts dirt faster.
Deep cleaning the machine every 1–2 months (and rinsing tanks after every use) prevents all three.
What You Need
You probably own everything already:
- Warm water
- White distilled vinegar (cuts mineral scale and odor)
- A soft bottle brush or old toothbrush
- A microfiber cloth
- Dish soap (a drop or two — not detergent, which foams)
- A sink or bathtub with a sprayer
Skip bleach and abrasive cleaners — they can crack plastic tanks and degrade rubber seals.
Step 1: Empty and Rinse Both Tanks
Remove the clean-water tank and the dirty-water tank. Pour out any remaining liquid, then rinse each tank with warm water until it runs clear. For the dirty-water tank, add a cup of warm water with a splash of white vinegar, shake vigorously for 30 seconds, and rinse. This dissolves the biofilm that causes odor.
Do not put tanks in the dishwasher unless the manual explicitly allows it — heat warps the plastic on most models.
Step 2: Clean the Dirty-Water Tank Lid and Float
The dirty-water tank lid contains a float mechanism that shuts off suction when the tank is full. Hair and sludge love to collect around it. Pop the lid assembly apart (most twist or clip off), scrub the float and lid with the bottle brush and warm soapy water, and rinse. A stuck float makes the machine shut off prematurely — the most common “lost suction” complaint that is not actually a clog.
Step 3: Flush the Hose
The hose is the smelliest part of any carpet cleaner. Here is the reliable method:
- Fill the clean-water tank with warm water (no solution).
- Attach the hose and run the machine into a sink or bucket for 60–90 seconds, letting clean water flush through.
- Detach the hose and hang it so both ends point down to drain completely.
- For stubborn odor, run a 50/50 mix of warm water and white vinegar through, then flush with plain water.
BISSELL’s SpotClean ProHeat 2694 even ships with a HydroRinse self-cleaning hose tool designed exactly for this — attach it and the machine flushes the hose automatically. If your model has a similar tool, use it after every single use. Our separate guide on how to clean a carpet cleaner hose goes deeper on stuck clogs and kinked hoses.
Step 4: Scrub the Brushes and Nozzles
Remove the brush roll or nozzle head. Pull off wrapped hair and fibers with your fingers or the crevice tool from your regular vacuum, then scrub the brush with warm soapy water and the toothbrush. Rinse well and let it air-dry completely before reinstalling — a damp brush reinstalled in a dark machine grows mildew overnight.
For the spray nozzle, check the jet opening for dried solution. A pin or needle clears mineral crust; vinegar dissolves it.
Step 5: Clean or Replace the Filter
Most carpet cleaners have a small foam or mesh filter protecting the motor from moisture and debris. Rinse foam filters in warm water, squeeze (do not wring), and air-dry for 24 hours before reinstalling. Never run the machine with a wet filter — moisture reaching the motor is the fastest way to kill a carpet cleaner. Replace filters that are torn, permanently discolored, or still smell after washing.
Step 6: Wipe Down the Machine Body
Wipe the exterior, the tank seats, and the underside of the machine with a damp microfiber cloth. Solution drips dry into sticky rings on the tank seats that prevent a proper seal — and a poor seal means weak suction. Check the rubber gaskets for cracks; a dried-out gasket is a cheap replacement part that restores suction dramatically.
Deep Cleaning a Full-Size Upright Carpet Cleaner
The steps above cover portable spot cleaners. If you own a full-size upright carpet cleaner, add these steps:
- Remove and scrub the brush roll cover. Full-size machines have a removable nozzle/brush cover — pop it off, pull out the brush roll, and remove wrapped hair and carpet fibers before scrubbing.
- Clean the suction nozzle channel. Run the bottle brush through the nozzle channel where dirty water enters the machine; this channel cakes with dried sludge on uprights.
- Check the belt and brush roll spin. With the cover off, confirm the brush roll spins freely. A seized brush roll on an upright usually means hair wrapped around the end caps — cut it away carefully.
- Rinse the clean-water bladder. Uprights with bladder-style tanks need the bladder rinsed and air-dried separately so mold cannot grow between the bladder and the tank wall.
Step 7: Dry Everything Before Storage
Reassemble only when every part is bone dry. Store the machine with the tanks empty and the lids slightly ajar so air circulates. Never store a carpet cleaner with solution in the tank — it gels, clogs the lines, and voids the “ready to use” promise next time you need it.
How Often to Deep Clean
| Usage | Rinse tanks | Flush hose | Full deep clean |
|---|---|---|---|
| After every use | Yes | Yes | — |
| Weekly use | — | — | Monthly |
| Monthly use | — | — | Every 2–3 months |
| Pet-stain emergencies | Yes, immediately | Yes | After each heavy session |
If you clean pet stains regularly, deep clean monthly — pet dander and urine residue break down faster and smell worse than ordinary dirt.
When to Consider a New Machine
Deep cleaning fixes most problems, but not all. Replace the machine if the motor sounds strained after a full clean-out, if tanks are cracked, or if suction stays weak with clear hoses and clean filters. If you are shopping, these three portable cleaners are easy to maintain and widely available:
BISSELL SpotClean ProHeat 2694 — 9.2 pounds, 37-oz clean tank, 4.5-foot hose, and the HydroRinse self-cleaning hose tool that makes Step 3 automatic. Heatwave technology keeps the water warm during cleaning.
Hoover CleanSlate Plus FH14050 — 9.4 pounds with a 40-oz (1.18L) tank capacity and versatile pet tools. The wide-path nozzle covers more area per pass, and the hose is designed to resist kinks that trap dirty water.
BISSELL Little Green 1400B — the classic portable spot cleaner, sold and shipped by Amazon. Compact, simple to disassemble for cleaning, and the specialty tools handle upholstery, stairs, and car interiors. A great choice if your main job is spot treatment rather than whole rooms — and it pairs well with our picks for the best carpet cleaners for apartments.
FAQ
How often should I deep clean my carpet cleaner?
Rinse both tanks and flush the hose after every use. Do a full deep clean (brushes, filters, gaskets, tank lids) monthly if you use it weekly, or every 2–3 months for occasional use.
Why does my carpet cleaner smell bad?
Bacteria growing in the dirty-water tank, hose, or a damp brush. Empty and rinse tanks after every use, flush the hose with vinegar water, and never store the machine damp. Persistent smell after a full deep clean means the filter needs replacing.
Can I use vinegar in my carpet cleaner?
White distilled vinegar is safe for flushing hoses and deodorizing tanks (rinse afterward). Do not use it as the cleaning solution on carpet unless your manual approves — it can void warranties and damage some carpet fibers.
Why did my carpet cleaner lose suction?
Check in order: full dirty-water tank, stuck float in the tank lid, clogged hose, dirty filter, cracked gasket on the tank seat. Nine times out of ten it is one of these, not a dead motor.
Can I put carpet cleaner tanks in the dishwasher?
Usually no. The heat warps most plastic tanks and degrades seals. Hand-wash with warm water unless your manual specifically says dishwasher-safe.
How do I remove dried cleaning solution from the spray nozzle?
Soak the nozzle in warm water with a splash of vinegar for 15 minutes, then clear the jet with a pin. Dried solution is the most common cause of weak or uneven spray.
Final Verdict
Deep cleaning your carpet cleaner is a 30-minute job that pays for itself: no more sour smells, full suction restored, and a machine that lasts years instead of months. Make the after-every-use rinse a habit — it takes two minutes and prevents 90% of problems. And if you are hunting for discounted machines, keep an eye on carpet cleaner deals during the holiday sales. One more tip for stain emergencies: for sticky messes like candy, our guide on how to remove gum from carpet works on fresh spills before they set.