Home & Garden Cleaning & Laundry

How to Clean Green Stains on Vinyl Siding

By Home & Garden Last updated Friday, June/14/2024

1). Wear rubber gloves.
2). Mix a gallon of warm water with ¾ lb. oxalic acid granules. Oxalic acid can be purchased from most hardware and home improvement stores. Oxalic acid is a toxic chemical that should be handled with care.
3). Apply the mixture to a sponge and rub over the green stain. Allow the solution to sit on the stain for 5 minutes.
4). Scrub the vinyl siding with a sponge or cleaning cloth to remove the stain.
5). Repeat steps 3 and 4 until the green stain is completely removed.
6). Wash down the siding with liquid dishwashing soap and warm water and dry with a soft cloth.

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