I suggest thinning it with 1 part thinner to 10 parts water and scrubbing on the stain only after testing a small inconspicuous area.
Cleaning painted vinyl siding.
Start at the bottom to avoid streaking and use your garden hose to rinse off each section before it dries.
Also latex paint is best preferably one that has a large solid content.
70 water 30 white vinegar makes a great all purpose vinyl.
Several brands of exterior paint are now available that are designed for use on vinyl siding.
If that doesn t work get your hands on some goof off or goo gone.
1001 do it yourself hints tips by reader s digest.
Basic vinyl siding cleaning apply the vinyl siding cleaning solution with a soft bristle cleaning brush scrubbing the full length of each lap.
Paint thinner or acetone is said to remove paint stains but may also dull dull the finish on your siding.
Start by mixing in a little household laundry detergent with some water and use a medium firm bristled brush to scrub off the paint.
Check with your local paint shop or hardware store for the lowdown.
Use a pressure washer with laundry detergent to get the surface sparkling clean.
Some good vinyl sider cleaner solutions include.
If you want to paint vinyl siding it should be sanded first for the paint to adhere properly.
When cleaning vinyl siding remember to thoroughly rinse away any residue as you go.