How to Clean and Store a Tent So It Survives the Winter
Tents almost never wear out. They get packed away damp once, and eleven months later the owner discovers a sticky, sour tent and buys another one.
The one rule that matters
The short answer
A tent must be bone dry before it goes into a bag, and it must be stored loose rather than compressed. Damp polyester grows mildew within days, and mildew does not just smell — it feeds on the polyurethane coating that makes the fly waterproof. That is the hydrolysis that turns an old fly sticky and flaky, and once it starts it cannot be reversed.
Almost every tent that gets replaced was destroyed by storage rather than by use. It is worth being blunt about this because the mistake is so easy: you strike camp in drizzle, you are going home anyway, and the tent goes in the boot wet. Three days later you have forgotten, and by the time you unpack it in spring the damage is a year old.
At the campsite: pack for the drying, not for the drive
If it is dry, shake the tent out, sweep the floor, and pack it. If it is wet, pack it anyway — you cannot dry a tent in the rain — but pack it in a way that admits you will have to deal with it. Roll it loosely into a bin bag rather than compressing it into its stuff sack, keep it away from anything you want to stay dry, and put a note on your phone for that evening.
Then get it out within 48 hours, whatever else is happening. A tent that spends a weekend wet is fine. A tent that spends a fortnight wet in a warm garage is not.
Drying it properly at home
Pitch it in a garden if you have one, or hang the fly and inner separately over a washing line, a bannister or the back of a couple of chairs. Turn it once. A tent looks dry long before it is: the webbing, the seam tape, the pole sleeves and the corners hold water for hours after the flat panels feel dry to the touch, and those are exactly the places mildew starts.
Dry it out of direct sun where you can. UV is what actually degrades tent fabric — a tent left pitched in strong sun all summer loses meaningful strength in a single season — so a shaded, airy spot is better than a hot one. Never put a tent in a tumble dryer or over a radiator; heat delaminates coatings.
Cleaning: less than you think
| Problem | What to do | What not to do |
|---|---|---|
| General dirt and grass | Sponge with lukewarm water | Washing machine, which abrades coatings and stresses seams |
| Mud on the floor | Let it dry, brush it off, then sponge | Scrubbing wet mud, which grinds grit into the coating |
| Sap and tar | Dab with mineral spirits on a cloth, rinse | Solvents on coated fabric or mesh |
| Mildew spots | Wash with a dedicated tent cleaner, dry fully | Bleach, which destroys the fabric and the coating |
| Zips full of grit | Rinse with clean water, dry, lubricate | Forcing a gritty zip, which is how teeth get pulled |
Use a technical fabric cleaner rather than detergent. Household detergent strips the water-repellent finish and leaves surfactant residue that attracts water afterward, which is why a tent often seems to leak more after a well-meaning wash.
Mildew: manage expectations
A tent cleaner and thorough drying will kill mildew and remove most of the smell. It will not remove the staining, and it will not restore coating that has already broken down. If the inside of the fly feels tacky or flakes off on your fingers, the polyurethane has hydrolyzed and the fly is at the end of its life — no cleaning or reproofing fixes that. Many manufacturers sell replacement flies, which is far cheaper than a new tent.
Reproofing, and what each product actually does
Three separate jobs get lumped together as “waterproofing a tent,” and they use different products:
- Seam sealing. Stitch holes leak. Factory tape lifts with age, and a seam sealer painted along the inside of the fly seams fixes it. Do this first, because it is the most common real leak.
- DWR refresh. The outer face of the fly sheds water by beading. When it stops beading and starts wetting out, a spray-on proofer restores it. This is maintenance, not repair, and it is worth doing once a season.
- Coating repair. A tent-floor sealant can extend a worn floor coating. It is a genuine repair rather than maintenance, and it is worth doing only on a tent you otherwise like.
The order matters: clean, dry, seal seams, then reproof, then dry again. Reproofing a dirty fly seals the dirt in.
Storage
Store the tent loose in a large cotton or mesh sack, or over a hanger in a wardrobe, not compressed in the stuff sack it came in. Compression sets permanent creases in coated fabric and the coating cracks along them, which is where old tents leak in tidy straight lines.
Keep it somewhere dry and temperature-stable. A loft that reaches 120 F in July and an unheated garage that condenses in November are both worse than a cupboard indoors. Store poles with their shock cord relaxed, stakes in a separate bag so they cannot puncture anything, and the whole thing off a concrete floor, which wicks damp upward.
Bagged and boxed, the tent belongs in the camp bin with everything else — the storage system is in best gear storage bins, and the sleeping bags in the same bin have their own rules in how to wash a sleeping bag.
The ten-minute check before the first trip of the year
Pitch it in the garden. It sounds excessive and it takes ten minutes, and it is how you find out that a pole section has split, a zip slider has worn, or a mouse has been in the bag — at home, on a Tuesday, rather than at dusk in a field. Check the poles for cracks at the ferrules, run every zip its full length, count the stakes, and look at the seam tape for lifting.
Then repitch it properly on the trip: tension the fly so it never touches the inner, guy out every point rather than four, and site it out of the hollow. That is the maintenance that keeps a cheap tent dry, and it is covered in best tents for rain.
Questions people actually ask
QCan you store a tent wet?
No. Damp polyester grows mildew within days, and mildew feeds on the polyurethane coating that keeps the fly waterproof. That damage is permanent. If you have to pack a tent wet, get it out and dried within about 48 hours.
QCan you wash a tent in a washing machine?
No. The agitation abrades the coating, stresses the seams and can damage mesh. Sponge it with lukewarm water and a technical fabric cleaner, and never use household detergent, which strips the water-repellent finish.
QHow should you store a tent long term?
Loose in a large cotton or mesh sack rather than compressed in its stuff sack, somewhere dry and temperature-stable, off a concrete floor. Compression sets creases in coated fabric and the coating cracks along them.
QWhy is my old tent sticky inside?
The polyurethane coating on the fly has hydrolyzed, usually after being stored damp or in heat. It cannot be reversed by cleaning or reproofing. Many manufacturers sell replacement flies, which is much cheaper than a new tent.
Sources
Every figure on this page comes from a published source. We have not tested this gear, so the numbers are the manufacturer's or the standard body's, not ours. How we research.