How to Wash a Car Cover the Right Way (Without Ruining the Fabric)
⚡ Quick Answer
Most car covers should be hand washed with cold water and a mild, non-abrasive soap, then air dried. Only put a cover in a machine if the tag allows it, and even then use a large commercial washer with no center agitator.
3 Steps To Wash Any Car Cover
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1
Rinse off loose dirt and dust with a hose first. -
2
Scrub gently with mild soap and cold or lukewarm water. -
3
Rinse twice, then lay it flat to air dry.
Mistakes That Wreck A Car Cover
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Never use bleach or fabric softener on the fabric. -
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Skip the pressure washer; it can tear the coating. -
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Don’t tumble dry unless the label says you can.
Your car cover is supposed to protect the paint. But if you park under a tree, that cover ends up wearing the tree instead — pollen, sap, and bird droppings baked in by the sun. Daniel Brooks has fielded this question from car owners more times than he can count: how do you get a car cover clean without wrecking the very fabric that’s supposed to guard your paint?
The short version is that a car cover is not a bedsheet. It’s engineered fabric, and the wrong wash can strip its water resistance or shred it in a washing machine. Below is exactly how to clean one safely, whether you’re dealing with dust, tree sap, or bird mess.
📌 Key Takeaways
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Hand washing is the safest method for almost every car cover material. -
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Machine washing only works in a large commercial washer with no center agitator. -
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Bleach and fabric softener both break down water-repellent coatings. -
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Air drying flat or on a line is required for most fabrics — the dryer will melt or shrink them.
Can You Machine Wash a Car Cover?
Sometimes, but check the tag first. A center-agitator washer — the kind with a spindle in the middle of the drum — can snag and tear cover fabric. So can a machine that’s too small for a full-size cover.
If your cover is labeled machine washable, use a large front-load or commercial unit with no agitator. Set it to a gentle cycle with cold or warm water, and let it rinse twice. That second rinse matters. Leftover soap residue can attract dirt right back to the fabric.
Most car cover makers, including Covercraft and Coverstore, actually recommend hand washing over machine washing for this exact reason. So what does that mean for you? If you’re not sure your washer qualifies, skip it. Hand washing is nearly as fast and carries zero risk to the seams.
Here’s how the two washing methods compare for a typical outdoor car cover.
How to Hand Wash a Car Cover, Step by Step
Hand washing works whether the cover is on the car or off. It cleans just as well as a machine and it’s the safer default. Here’s the full process most cover manufacturers recommend.
🔢 Step-by-Step: Hand Washing a Car Cover
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1
Hose off loose debris first
Rinse the cover with cold water on a low setting to knock off dust and grit before soap touches it.
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2
Mix a mild soap solution
Stir about one ounce of mild dish soap or gentle detergent into a gallon of lukewarm water.
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3
Scrub with a soft sponge or brush
Work in sections, leave the cover on the car if that’s easier, and go over stained spots twice.
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4
Rinse twice with plain water
Keep rinsing until no suds appear. Leftover soap can leave a film that attracts more dirt.
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Lay it flat to air dry
Spread it on a clean surface or hang it on a line, out of direct midday sun if possible.
⚠️ Warning
Skip the pressure washer. The force can tear seams and strip the water-resistant coating right off the fabric.
What Soap Is Safe for a Car Cover?
Stick to something mild and non-abrasive. A gentle dish soap or laundry detergent diluted in water works for routine dirt. For tougher grime, a dedicated all-purpose cleaner designed for washable fabrics does more without damaging the coating.
You might be thinking any household cleaner will do. Here’s why that’s risky: bleach, ammonia, and alcohol-based cleaners can all weaken the fibers and break down water resistance over time, according to cover maker Coverstore’s care guide.
One widely used option is Simple Green All-Purpose Cleaner, which carries the EPA’s Safer Choice certification and is commonly recommended by cover makers for spot-treating stains before a full wash.
📋 Soap Rules for Car Covers
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Use mild soap: Dish soap or gentle laundry detergent, about 1 ounce per gallon of water. -
Skip fabric softener: It coats fibers and reduces breathability. -
Spot test first: Try any new cleaner on a hidden corner before using it on the whole cover.
How to Remove Bird Droppings and Tree Sap From a Cover
Tree parking is convenient until you see what lands on the fabric. Bird droppings and sap both need extra soak time before regular washing, or they’ll stay baked into the weave.
Bird Droppings
Mix warm water with detergent and a splash of vinegar. Rub the solution onto the stain with a soft cloth until it lifts. A spray cleaner made for bird droppings works too, and it’s often faster on set-in stains.
Tree Sap
Sap needs a solvent, not soap. Dab denatured alcohol onto a cloth and rub the spot gently until the sap breaks down. So what does this mean for you? Treat stains the same day they happen — sap only gets harder to remove the longer it bakes in the sun.
✅ Tip
Soak stained spots in warm water for a few minutes before scrubbing. It loosens dried sap and droppings so you don’t have to scrub hard.
How to Dry and Store a Car Cover After Washing
Drying matters as much as washing. Most car cover fabrics need to air dry — the dryer’s heat can shrink or melt synthetic weaves, and it can crack water-resistant coatings.
Lay the cover flat on a clean driveway, lawn, or line, right side out. Turn it over once the first side is dry so both sides get full air exposure. If a few damp patches linger, blot them with a towel instead of waiting.
Once it’s fully dry, fold it loosely and store it somewhere dry and out of direct sun. A damp cover folded into storage will grow mildew fast — that’s the single most common reason cover fabric fails early.
What Most People Get Wrong About Washing a Car Cover
“Any washing machine works.” A standard home washer with a center agitator can snag and tear cover fabric. Only agitator-free commercial machines are safe, and even then only if the tag says machine washable.
“Bleach is fine since it’s just an outdoor cover.” Bleach breaks down the water-repellent coating that makes the cover useful in the first place. Once that coating is gone, moisture soaks straight through to the paint.
“It’s fine to leave it damp in the trunk for a few days.” Folding a damp cover traps moisture against the fabric and invites mildew, which stains permanently and weakens the weave.
Conclusion
A clean car cover does its job better and lasts longer. Stick to cold or lukewarm water, mild soap, and a full air dry, and skip bleach, softener, and the pressure washer entirely. That’s really all it takes.
One thing to do right now: pull your car cover out and check the manufacturer’s tag for wash instructions before you clean it next.
Frequently Asked Questions
How often should you wash a car cover?
Wash a car cover every few months under normal conditions, or sooner if it’s visibly dusty, stained, or has been under a tree. Regular cleaning keeps the fabric breathable and its water resistance intact.
Can you wash a car cover in a home washing machine?
Only if the manufacturer’s tag says it’s machine washable, and only in a large machine without a center agitator. Most home washers have an agitator that can tear the fabric, so hand washing is usually the safer choice.
Can you dry a car cover in a dryer?
Not unless the label specifically allows it. Dryer heat can shrink synthetic fabric and damage the water-resistant coating. Air drying flat or on a line is the safe default for nearly every cover material.
What removes bird droppings from a car cover?
A mix of warm water, mild detergent, and a bit of vinegar usually lifts bird droppings when rubbed in with a soft cloth. A dedicated dropping-remover spray also works well on stains that have already dried.
Why does my car cover smell musty after washing?
A musty smell almost always means the cover was folded or stored before it fully dried. Rewash it, air dry it completely on both sides, and store it only once it’s bone dry.
Is it safe to use bleach on a car cover?
No. Bleach breaks down the water-repellent coating on most car cover fabrics, which lets moisture soak through to the paint. Stick to mild soap or a cleaner rated safe for washable outdoor fabric instead.
Can you wash a car cover while it’s still on the car?
Yes, hand washing works fine with the cover still on the vehicle. Rinse it, scrub it with soapy water, rinse twice more, and let it air dry in place before folding or removing it.
Daniel Brooks is an automotive writer and product researcher focused on car accessories, car tech, maintenance, and practical driving guides. At Plug-in Car World, he helps drivers make smarter automotive decisions through honest reviews and research-driven content.