- 1). Add 1 cup of detergent to 1 gallon of warm water and mix well.
- 2). Dip a sponge into the detergent-water mixture, and sponge the cleaner onto the fiberglass surface.
- 3). Mix 1 cup of chlorine bleach into your detergent-water solution if you have mildew stains on the fiberglass.
- 4). Sponge the mixture onto the fiberglass stain.
- 5). Rinse the area with water and let it air-dry.
- 6). Make a paste from baking soda and water to remove stubborn stains on fiberglass.
- 7). Moisten the surface of the fiberglass, and then rub the paste onto the stained area.
- 8). Wipe away the paste with a soft cloth to remove the stain.
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