I suggest thinning it with 1 part thinner to 10 parts water and scrubbing on the stain only after testing a small inconspicuous area.
Clean paint from vinyl siding.
Once you ve made your solution simply pour it on the paint and use a brush to scrub it off before rinsing the area with water by using a power washing with the rinse nozzle.
Start at the bottom to avoid streaking and use your garden hose to rinse off each section before it dries.
Start by mixing in a little household laundry detergent with some water and use a medium firm bristled brush to scrub off the paint.
Paint thinner or acetone is said to remove paint stains but may also dull dull the finish on your siding.
If that doesn t work get your hands on some goof off or goo gone.
How to remove oil based paint from vinyl siding.
If your vinyl siding is affected by water based paints it s easy to remove it with a solution of laundry detergent and warm water.
How to remove paint from vinyl siding if some wet paint accidentally splashed onto the surface of your vinyl siding don t panic.
Rub the spot with a rag dampened in warm soapy water to remove any not yet dried paint from the surface.
If the stain is.
Mineral spirits a cloth a soft bristle brush.
Basic vinyl siding cleaning apply the vinyl siding cleaning solution with a soft bristle cleaning brush scrubbing the full length of each lap.