TL;DR
A collapsible cat tunnel is fabric wrapped around a spring steel hoop, so the frame is what limits your options. Vacuum the inside first with a crevice tool, then hand wash with unscented soap in warm water rather than machine washing, and dry it opened out flat. A twisted or kinked hoop never sits right again.
Why the frame decides the method
Inside the fabric edge of most tunnels there is a continuous loop of spring steel, the same kind used in pop-up laundry hampers. That hoop is what lets the tunnel collapse into a flat circle and spring back.
A washing machine twists and crushes that hoop. Once the steel takes a permanent kink, the tunnel sits crooked, the fabric puckers, and it will not collapse or open cleanly again. Heat from a dryer adds shrinkage of the fabric around a frame that does not shrink, which puckers the whole thing.
So the method is hand washing, with a long dry. The frame also means the tunnel should be dried opened out, not folded, so the fabric dries in the shape it will be used in.
What is actually in there
Cat tunnels collect more than people expect, because cats sleep in them as well as run through them.
Loose fur and dander are the bulk of it. Crinkle-material tunnels have a layer of plastic film inside the fabric that traps hair in the seams. Peep holes and dangling toys collect fur where the fabric is stitched.
Then there is food debris carried in, litter tracked from paws, and occasionally a hairball. That last category needs enzyme treatment rather than a rinse.
How do you wash a cat tunnel?
Vacuum the inside and outside with a crevice tool, then hand wash the tunnel in warm water with a small amount of unscented soap, pressing rather than wringing. Rinse until no suds appear, press the water out between towels, and dry it fully opened out with air moving through it.
The step-by-step routine
1. Take out any inserts and hanging toys. Wash those separately.
2. Vacuum the inside thoroughly. A crevice tool run down the length of the tunnel, then around the openings and the seams. This removes most of the fur, and it is far easier dry.
3. Dry brush the fabric. A rubber brush or a grooming glove lifts embedded hair that the vacuum leaves. Lint roller for the last of it.
4. Shake it out outdoors. Hold one opening and shake firmly. You will be surprised.
5. Hand wash in warm water with unscented soap. A bathtub is the easiest place. Press the fabric under the water repeatedly rather than scrubbing hard, and support the frame so it does not fold sharply.
6. Spot scrub any marks. A soft brush and a little more soap, working gently to avoid abrading plush or crinkle layers.
7. Rinse until no suds appear. Run clean water through the tunnel and press it out several times. Residue attracts fur and can irritate skin.
8. Press the water out between towels. Never wring a tunnel. Wringing is exactly what kinks the hoop.
9. Dry it opened out. Stand it upright or lay it on its side somewhere with moving air, and turn it a few times. A full day is normal, two days for plush.
Crinkle tunnels take longer, because the internal film slows evaporation. Make sure the fabric is dry all the way through before your cat goes back in.
Keep it unscented, and keep oils away
Cats rub their faces against the openings of a tunnel and groom whatever transfers onto their fur, so what you leave behind matters.
Many essential oils are toxic to cats, including tea tree, citrus, pine, eucalyptus, and peppermint. Do not use scented cleaners, fragrance sprays, or homemade citrus mixtures on anything a cat sleeps in.
Skip fabric softener as well. It leaves a coating and a lingering scent, and a strongly scented tunnel is a tunnel cats stop using.
Never use chlorine bleach. It weakens fabric, fades color, and must never be mixed with ammonia, which is present in urine, or with vinegar or any other acid, since those combinations release chloramine and chlorine gas.
Source: ASPCA Animal Poison Control Center guidance on essential oils and cats
Accidents, hairballs and odor
For urine, vomit, or a hairball, blot up what you can first, rinse the area with plain water, and then use an enzyme-based pet cleaner. Let it stay wet for the time on the label, rinse, and dry fully.
Enzymes break down the compounds that cause the smell instead of covering them, which is why a scented spray on a tunnel makes things worse rather than better.
Baking soda handles light odor between washes. Sprinkle it inside, leave it fifteen minutes, then vacuum it out thoroughly.
If a cat starts urinating in a tunnel or in other unusual places, that is a veterinary appointment before it is a cleaning problem. Urinary conditions can be urgent and cleaning does not address the cause.
Storage and lifespan
Collapse the tunnel only once it is completely dry, and store it in its bag or flat under furniture. A damp tunnel folded into a bag develops mildew smell within days.
Check the fabric edges where the hoop sits. If the steel is starting to poke through the seam, retire the tunnel. Exposed spring steel is sharp and a genuine injury risk.
Also check for torn peep holes with loose threads, and cut away any dangling string or elastic. Cats swallow string, and a swallowed string is an emergency, not a wait-and-see problem.
How often should you clean it?
Vacuum it weekly with the rest of the room, and hand wash it every one to two months, or sooner if a cat sleeps in it daily. Shedding season doubles the frequency.
Cleaning day is a good time to do the whole set of cat furniture at once, since the fur load is shared. The plush and sisal surfaces of a cat tree follow their own method in how to clean a cat tree and scratching post, and window perches add suction cups, covered in how to clean a cat window perch.
For bowls, beds, toys and travel gear, our guide to cleaning pet bowls, bedding, toys and gear keeps the same unscented and dry-fully approach.
FAQ
Can you put a cat tunnel in the washing machine?
Usually not. Most collapsible tunnels have a spring steel hoop sewn into the fabric edge, and a machine twists that hoop into a permanent kink so the tunnel never sits or folds properly again. Hand wash in warm water with unscented soap instead.
How do you get cat hair out of a cat tunnel?
Vacuum the inside and outside with a crevice tool while the fabric is dry, then dry brush it with a rubber brush or a grooming glove to lift embedded hair. Finish with a lint roller. Doing this before any water is involved makes a large difference.
How long does a cat tunnel take to dry?
A plain fabric tunnel dries in about a day with air moving around it. Plush and crinkle tunnels can take two, because the internal film slows evaporation. Dry it opened out rather than folded, and make sure it is dry all the way through before use.
Can you use fabric softener or scented cleaner on a cat tunnel?
No. Softener leaves a coating and a lingering scent on something a cat sleeps in and grooms against. Many essential oils are toxic to cats as well. Use unscented soap only, rinse until no suds appear, and skip fragrance sprays around the area entirely.
How do you get the smell out of a cat tunnel?
Vacuum thoroughly first, since trapped fur causes most of it. For urine, vomit, or hairballs, blot, rinse with plain water, then apply an enzyme-based pet cleaner and leave it wet for the time on the label. Baking soda vacuumed out helps between washes.
When should you replace a cat tunnel?
Replace it when the spring steel starts poking through the fabric seam, since exposed steel is sharp and can injure a cat. Also retire one with torn peep holes trailing loose thread, or any dangling string, because swallowed string is a veterinary emergency.
Pet furniture is a small part of a much larger job. Every home is different, so the real number depends on size, condition, and what you want covered. Get a quote or read more about house cleaning services.