Proper care of your spa cover is a key to maintaining good water balance. Use this guide to help clean the inside of your cover easily.
Your cover is made up of both an outer layer or vinyl “skin” which is always visible, and the internal wrapped cores which give the cover its insulation value and rigidity.
On occasion, black mold can grow on the inside of the skin and wrapped cores. When this happens, any water that accumulates on the underside and the interior of the cover (from the steam of the spa) becomes contaminated with mold. If left untreated, this water will eventually drain from the vinyl skin back into the hot tub, depositing bacteria into the water, creating an odor that is difficult to remove.
To prevent contamination and the unpleasant odor, eliminate the mold by washing both the skin and the cores with a solution of 2 quarts liquid bleach and 3 gallons water. Be sure to wear rubber gloves to protect your hands when using the solution. Given the size of the cover, it may be easier to complete this procedure with two people.
Fold the cover open and unzip each half.
With a person on either side of the cover, carefully remove the cores, pulling evenly from each side as you proceed.
Using a Scotch-Brite pad, wash the plastic wrap covering the Styrofoam cores with the bleach/water solution. Use the sponge side to avoid scratching the plastic wrap over the cores. In tougher areas, it is okay to use the “scrubbie” side of the sponge to fully remove the mold.
Take care not to loosen or remove the edge tape on the cores. Rinse the cores with clean water and set each half aside, out of direct sunlight to avoid possible distorting of the core material.
Next, carefully lay open the vinyl skin and use a sponge and soft brush (as needed) to wash the inside with the bleach/water solution. Rinse with clean water.
Dry both the cores and inside of vinyl skin with a clean, dry towel.
With another person to help, position the vinyl skin and carefully re-insert the cleaned cores. Pull the cover forward until the cores are properly fitted and close each zipper. Be careful not to tear the tape at each corner.
Check to make certain the bottom of the cover is free of debris before putting it back onto your hot tub.