Hot Tub Cover Maintenance: How to Clean It and Make It Last

Last updated: September 2026

The hot tub cover is a simple but often overlooked necessity. It takes the brunt of the weather while (hopefully) keeping the heat in, so your tub doesn’t cost the Earth to run. Buying a good cover is one thing. Making it last, and making sure it looks after your tub, means keeping it clean and maintained.

In this post I’ll explain how to do that: what to clean it with (and what not to), how to deal with mildew and how to tell when it’s time for a new one.

How to clean and maintain your hot tub cover

A little regular care goes a long way, and saves you money in the long run. A few simple habits stop sun damage, mould growth and premature chemical wear.

Everyday cleaning

Brush off leaves, sticks, bugs and other debris as needed. Covers are designed to shed rainwater, but snow and debris still build up. A quick sweep with a soft push broom is all it takes. Avoid anything with sharp edges that could damage the vinyl. If a lot of snow has landed, clear it. The weight can crush the foam.

Deep cleaning (every couple of weeks)

1. Take the cover off and lay it flat on a soft, non-abrasive surface.
2. Spray it with a vinyl-safe cover cleaner and wipe or rinse it off, following the product’s instructions. Clean the sides and bottom too.
3. Avoid cleaners containing alcohol, detergents, oils or silicone, and skip the bleach. They can dry out and damage the vinyl and stitching.
4. Rinse thoroughly with clean water, and let it dry completely.
5. Apply a vinyl protectant or conditioner (I’d use a UV product such as 303) every few months. It boosts UV resistance, helps prevent cracking and keeps the material soft.

For marks and stains that won’t come off, see how to remove hot tub cover stains without harming the vinyl.

Cleaning the underside of your cover

Most of the time the underside won’t need much attention. If you notice a musty smell or visible dirt, a quick clean helps:

• Remove the cover and lay it flat.
• Wipe the plastic underside with a cloth and a mild solution of white vinegar and water (about 1 part vinegar to 10 parts water).
• Rinse thoroughly with fresh water and let it dry in the air.

Important: avoid household cleaners with detergents or phosphates. If they drip into the tub, they can cause foam, algae or chemical imbalance. Some chemicals are also unsafe for bathers. If the tub has been shocked, leave the lid open for 20 minutes or so, so the fumes don’t sit under the cover and attack the underside. See hot tub shock.

Dealing with odours and mildew

• Surface mildew: scrub the area with a vinyl-safe cleaner, then wipe with diluted white vinegar. Rinse well.
• Mildew on the underside: use the vinegar solution above and let the cover air out in the sun.
• Mould in the foam: if it’s penetrated the vapour barrier and reached the foam core, it’s unfortunately beyond repair, and you’ll need a new cover.

Basic maintenance for a long-lasting cover

• Inspect for damage. Patch small vinyl tears straight away with a vinyl repair kit, and fix broken zips promptly so water doesn’t get into the foam.
• Let it dry out. If the cover stays damp 24/7, it won’t last. Take it off at least once a month while you clean the tub and balance the water, and let it dry completely before you put it back.
• Keep the water balanced. Test weekly, or more if the tub gets heavy use. Proper chemistry (see the chemical balancing guide) stops bacteria and algae building up, which otherwise leads to moisture and smells in the cover.
• Use a cover lifter. Dragging a heavy cover across the rim wrecks hinges and skirts.

Is it time to replace your hot tub cover?

A well-looked-after cover can last for years, but eventually it needs replacing. How long it lasts depends on proper care: balanced water, clearing debris and heavy snow, a UV protectant and a cover lifter. Even so, wear and tear is inevitable. Here’s how to tell.

1. Damaged vinyl

The outer vinyl is your first defence against the weather. Check for cracks, tears and worn areas. If the cover no longer fits snugly, it can’t protect the tub properly.

2. Worn or broken straps

Straps hold the cover secure in wind. Look for fraying, wear or rot, and make sure they still lock tight to the tub’s frame.

3. Heavy, waterlogged foam

The insulation is thick foam, which should stay light. If it feels heavy or sags, it’s absorbing water, and it insulates much less. Water pooling on top makes it worse, makes the cover harder to lift and costs you energy.

4. Weak or damaged hinge

Most covers fold in the middle. Over time the hinge can weaken or tear, especially if the foam is waterlogged. A damaged hinge leaks a lot of heat.

5. Worn hinge seal

The hinge seal stops heat escaping through the centre crease. If it’s torn or flattened, you’ll see steam escaping.

6. Musty or mouldy smell

A strong, musty smell means water has got inside and mould is growing. It’s one of the clearest signs you need a new cover.

If you’ve noticed one or more of these, it’s time to invest in a new cover. Keep in mind that a good cover pays for itself in lower running costs (see hot tub energy efficiency). Read the ultimate guide to hot tub covers for types and costs, or how to make a DIY hot tub cover if you’re building your own. For the bigger maintenance picture, see my beginner’s guide to hot tub maintenance, and if you’re closing the tub down for winter, winterizing your hot tub.

Parts and spares

For spare parts, filters and accessories, see parts4tubs.co.uk (UK) or parts4tubs.com (USA). Building your own tub? My hot tub plans are there when you are ready.

FAQs

How often should I clean my hot tub cover?

Brush off debris as needed, and give it a proper clean about every two weeks. Apply a UV protectant every few months.

Can I use bleach on a hot tub cover?

No. Bleach, detergents, dish soap and alcohol can damage the vinyl and stitching. Use a vinyl-safe cover cleaner, and diluted white vinegar for the underside.

How long does a hot tub cover last?

With regular cleaning, a UV protectant, balanced water and a cover lifter, it can last several years. Waterlogged foam is the usual reason it’s replaced.

Why does my hot tub cover smell?

Usually mildew or mould from moisture that’s got in, or from chemical fumes trapped under the cover. Clean and dry it, and leave the lid open for a while after shocking. If the foam is mouldy, replace the cover.

How do I know if the foam is waterlogged?

It feels heavy or sags in the middle, and it’s harder to lift than it used to be. A strong musty smell is another sign.

Got a question about your own tub? Drop it in the comments below. I read them all.

Cheers,
Andi

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Thanks - Andi

 

Hi, Andi here. I own Buildahottub.com and also write all of the articles and info pages on the site. Some years back now, I built my own hot tub but struggled to find the information I needed. So, once my tub was complete, I started this website to help others in their own pursuit of hot tub and plunge pools DIY building information.

Fast forward to 2025, I've helped over 1400+ DIY customers just like you all over the world build hot tubs and pools. Have a good look around the site, there are lots of resources here. Please do get in touch if I can help you. - Cheers, Andi