A well-fitting hot tub cover helps retain heat, reduce evaporation, and keep leaves, dirt, insects, and other debris out of the water. Caring for it can help preserve its appearance, insulation, and fit while making routine spa maintenance easier.
Hot tub covers are available in vinyl, polyester, and other weather-resistant materials. Because cleaning instructions vary, check your cover warranty or owner’s manual before applying any cleaner, conditioner, or protectant.
What You’ll Need
Depending on your cover material, you may need:
- A garden hose with a gentle spray nozzle
- A large sponge or soft cloth
- A soft nylon brush
- A cover cleaner approved for the material
- An approved vinyl conditioner or protectant, if applicable
- Clean towels
- A soft broom for loose leaves or snow
Avoid abrasive brushes, pressure washers, harsh chemicals, and unapproved household cleaners. These products may damage the outer material, stitching, vapor barrier, or protective finish.
How to Clean a Hot Tub Cover
1. Remove Loose Debris
Use a soft broom or your hands to remove leaves, twigs, and dry debris before taking the cover off the spa.
During winter, clear snow regularly before its weight places unnecessary stress on the cover. Do not use a metal shovel or sharp tool that could puncture the material. Never attempt to chip or pry away ice.
2. Remove the Cover Carefully
Release the locking straps and remove the cover using its handles or a cover lifter. Large covers can be awkward and heavy, so ask another person for assistance when necessary.
Place the cover on a clean, soft surface. Avoid dragging it across concrete, gravel, decking, or other rough materials.
3. Rinse the Top Surface
Lightly rinse the exterior with a garden hose to remove dust and loose dirt. Do not use a pressure washer, which may damage the material and force water into the seams.
4. Clean the Exterior
Apply a cleaner approved for your cover material or prepare the mild cleaning solution specified by the manufacturer.
Use a sponge, soft cloth, or soft nylon brush to clean the surface gently. Work in small sections, paying extra attention to bird droppings, tree sap, pollen, and other stains.
Avoid aggressive scrubbing, especially around seams, handles, and locking straps.
5. Rinse Thoroughly
If the product directions require rinsing, remove all cleaner before it dries. Cleaner residue may leave streaks, damage the cover material, or enter the hot tub water.
Even products labeled as no-rinse should be used according to their directions.
6. Clean the Underside
Turn the cover over carefully and rinse the underside with clean water. Use a soft sponge to remove visible residue.
Only apply soap or another cleaning product to the underside if your cover manufacturer specifically recommends it. Cleaner residue on the interior surface can drip into the spa and affect the water chemistry.
A diluted vinegar solution is sometimes suggested for mildew, but it is not approved for every cover material. Check the manufacturer’s instructions before using vinegar, bleach, or any other household product.
7. Let the Cover Dry
Wipe away excess water and allow both sides of the cover to dry completely. Pay attention to seams, folds, handles, and the skirt around the cover.
Allowing the cover to dry helps discourage odors and surface mildew.
8. Apply Protectant if Approved
Vinyl covers may benefit from a non-petroleum-based protectant designed specifically for spa covers. Apply it only to the exterior and follow the label directions.
Do not apply vinyl protectant to fabric or polyester covers unless the manufacturer approves it. Some materials have factory-applied finishes that incompatible products can damage.
9. Inspect and Reinstall the Cover
Before returning the cover to the spa, inspect:
- Seams and stitching
- Handles
- Locking straps and clips
- Hinges and folds
- The skirt around the cover
- The underside and vapor barrier
- The overall shape and fit
Place the cover squarely on the spa and fasten every locking strap.
Do You Need a Special Hot Tub Cover Cleaner?
Not always. Some cover manufacturers recommend an approved spa-cover cleaner, while others permit a very mild soap solution.
The safest choice is the product or cleaning method listed in your cover’s care instructions. A cleaner formulated for vinyl may not be suitable for a polyester or fabric cover.
Unless specifically approved, avoid products containing:
- Petroleum or oils
- Alcohol or solvents
- Silicone
- Citrus-based ingredients
- Bleach
- Abrasive particles
When using any cleaner, prevent it from entering the spa and rinse away residue as directed.
How Often Should You Clean a Hot Tub Cover?
Inspect the cover at least once a month and clean it whenever dirt or residue begins to collect. Covers exposed to trees, birds, pollen, road dust, or severe weather may need attention more frequently.
Remove bird droppings, tree sap, and spills promptly rather than allowing them to set into the material.
How to Prevent Mold and Mildew
Mildew on the underside of a cover can be encouraged by persistent moisture, poor water balance, or trapped chemical vapors.
To reduce buildup:
- Keep the spa water properly balanced.
- Follow product directions about leaving the cover open after adding chemicals.
- Allow the cover to air out periodically.
- Dry the cover fully after cleaning.
- Address damaged seams or vapor barriers promptly.
- Avoid applying unapproved products to the underside.
If mildew returns quickly or appears to be inside the foam core, the cover may be waterlogged or damaged.
When Should You Replace a Hot Tub Cover?
Replace or professionally evaluate the cover when you notice:
- Cracks, tears, or brittle material
- Broken handles or locking straps
- Sagging or loss of shape
- A poor seal around the spa
- Excessive weight from absorbed water
- Damaged or exposed foam
- Persistent odors or internal mildew
- A cover that no longer fits securely
A damaged or waterlogged cover may retain less heat and become difficult to handle safely.
Hot Tub Cover Safety Tips
Keep the cover securely fastened whenever the spa is unattended. However, a cover is only one part of hot tub safety.
Use an appropriately rated, properly fitted cover along with the barriers, gates, alarms, and access controls required in your area. Adult supervision remains essential whenever children are near a hot tub.
Never allow anyone to sit, stand, walk, or place heavy objects on the cover unless it is specifically designed and rated for that purpose.
With gentle cleaning, careful handling, and regular inspections, your hot tub cover can continue protecting your spa through every season.
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