- Remove any peeling or flaking paint from the wood, if applicable, using a paint scraper. Mildew can thrive underneath loose paint, as well as on exposed wood.
- Wet any plants, shrubs and grass near the fence wood with water to protect them from the trisodium phosphate runoff.
- Fill a bucket with 1 gallon of warm water. While wearing rubber gloves, thoroughly mix 10 tbsp. of trisodium phosphate and 1 cup of chlorine bleach into warm water.
- Dip a nylon bristle brush into the trisodium phosphate and bleach solution. Scrub the fence wood with the nylon bristle brush and solution until the green mildew is completely removed.
- Rinse the wood with fresh water to wash away the solution. Allow the wood to thoroughly air dry in the sunlight.
- Apply two coats of mildew-resistant paint to the wood using a paintbrush. Let each coat of paint air dry according to the paint manufacturer's instructions.
Things You Will Need
- Paint scraper
- Garden hose
- Rubber gloves
- 10 tbsp. trisodium phosphate
- 1 cup chlorine bleach
- Nylon bristle brush
- Mildew-resistant paint
- Substitute washing soda for the trisodium phosphate.
- Remove severe mildew stains with a solution of 3 tbsp. oxalic acid and 1 pt. water. Wear protective gear while handling the solution, since oxalic acid is poisonous. Thoroughly rinse the wood when finished cleaning with oxalic acid.