Hot Tub Cover Maintenance

The Hot Tub Cover – a simple, but often overlooked necessity for our beloved Hot Tubs. They bear the brunt of the elements, whilst hopefully keeping the heat in so our tubs don’t cost the Earth to run. 

Investing in a hot tub cover is one thing but making sure it lasts you well and takes care of your tub requires that they’re kept clean and maintained. 

So how do we keep them clean and properly maintained? In this post, I’ll explain just how to do that.

How to Clean and Maintain Your Hot Tub Cover

A little regular maintenance goes a long way in extending the life of your hot tub cover and saving you money in the long run. By following a few simple cleaning habits, you can prevent sun damage, mold growth, and premature chemical wear.

Daily Cleaning

Brush off leaves, sticks, bugs, and other debris as needed. Outdoor covers are designed to shed rainwater, but snow and debris can still accumulate. A quick swipe with a soft push broom is all it takes—just avoid anything with sharp edges that could damage the vinyl.

Deep Cleaning (Twice a Month)

To keep your cover in top shape, give it a thorough cleaning at least every two weeks:

1. Remove the cover completely and lay it flat on a soft, non-abrasive surface.
2. Spray it with a vinyl-safe cleaner and wipe or rinse it clean, following the product’s instructions. Be sure to clean the sides and bottom as well.
   • Avoid cleaners that contain alcohol, detergents, oils, or silicone, as they can damage the vinyl.
3. Disinfect the underside of the cover with a 1:10 solution of distilled white vinegar or bleach to water (vinegar is gentler on vinyl).
4. Apply a vinyl protectant or conditioner to enhance UV resistance, prevent cracking, and keep the material soft.

With just a little routine care, your hot tub cover will stay clean, durable, and effective for years to come!

HOW TO CLEAN THE UNDERSIDE OF YOUR SPA COVER

Most of the time, the underside of your spa cover won’t need much attention. However, if you start noticing a musty smell or visible dirt and discoloration, a quick clean can help. Here’s how:

• Mix a 10:1 solution of water and bleach in a spray bottle.
• Remove the spa cover and lay it flat.
• Lightly spray the plastic underside, then rinse thoroughly with fresh water.

Important: Avoid using household cleaners, as they can introduce phosphates or detergents into your spa water, leading to issues like algae growth, foaming, or chemical imbalances. Some chemicals may even be unsafe for spa users.

Dealing with Odors & Mildew

If your cover has a lingering odor, mold or mildew may be the culprit. Here’s how to handle it:

• Surface mildew: Scrub the affected area with a vinyl-safe cleaner, then treat it with a diluted vinegar or bleach solution.
• Mildew on the underside: Use a disinfectant spray to control minor mold buildup.
• Deep-set mold in the foam: Unfortunately, if mold has penetrated the vapor barrier and reached the foam core, it’s likely beyond repair, and you may need a new cover.

Basic Maintenance for a Long-Lasting Cover

Prevent major issues with regular upkeep:

• Inspect for damage: Patch small vinyl tears immediately with a vinyl repair kit. Broken zippers should be fixed promptly to prevent water from seeping into the foam.
• Let it dry out: If your spa cover stays damp 24/7, it won’t last long. Remove it at least once a month while you clean the hot tub and balance the water, letting it dry completely before putting it back.
• Maintain water chemistry: Test and balance your spa water weekly (or more often if frequently used). Proper water chemistry prevents bacteria and algae from developing, which can otherwise lead to moisture absorption and unpleasant odors in your cover.

By following these simple steps, you’ll keep your spa cover in top shape, extend its lifespan, and enjoy a cleaner, fresher hot tub experience.

Is It Time to Replace Your Hot Tub Cover?

A well-maintained hot tub cover can last for years, but eventually, replacement becomes necessary. How long your cover lasts depends on proper care—keeping water chemistry balanced, clearing off debris and excess weight, applying a UV protectant like 303, and using a cover lifter all help extend its lifespan.

However, even with the best care, wear and tear is inevitable. Here’s how to know when it’s time for a new cover:

1. Damaged Vinyl Exterior

The outer vinyl layer is your cover’s first line of defense against the elements. Check for cracks, tears, or worn-out areas. If the cover no longer fits snugly, it may be losing its ability to protect your spa effectively.

2. Worn or Broken Straps

Cover straps ensure a secure fit, even in extreme weather. Inspect them for signs of wear, fraying, or rot. Make sure they still lock tightly to the spa frame, creating a proper seal.

3. Heavy, Waterlogged Foam

Your cover’s insulation is made of thick foam, which should remain lightweight. If the foam feels heavy or sagging, it’s likely absorbing water, reducing its effectiveness. Pooling rain or snow on the surface can worsen sagging, making the cover harder to lift and reducing energy efficiency.

4. Weak or Damaged Hinge

Most hot tub covers fold in the middle for easy storage, but over time, the hinge can weaken, fray, or tear—especially if the cover has become waterlogged. A damaged hinge leads to significant heat loss, making your spa work harder to maintain its temperature.

5. Worn Hinge Seal

The hinge seal helps prevent heat from escaping through the center crease of the cover. If it’s torn, flattened, or deteriorating, you may notice air or steam escaping, reducing the cover’s insulation efficiency.

6. Musty or Mildew Odor

One of the clearest signs it’s time for a new cover is a strong, moldy, or musty smell. This odor indicates that water has seeped inside, leading to mold and mildew growth. Not only can this create an unpleasant spa experience, but it can also affect other components of your cover.

Final Thoughts

If you’ve noticed one or more of these signs, it’s time to invest in a new hot tub cover. Regular inspections and maintenance will help maximize your cover’s lifespan, but when replacement becomes necessary, upgrading to a high-quality, well-fitted cover will keep your spa efficient, protected, and looking great.

Check out my shop here for hot tub covers.

References
paradisepoolandspa.net
swimuniversity.com
soncopools.com
poolstorecanada.ca

 

 

Can I Help You?

If I can help you in any way I would love to hear from you. You can get in touch using the form below.

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