Plexiglass is a type of thermoplastic that looks like glass, but is lighter and less sensitive. If paint accidentally stains your plexiglass, the plexiglass must be cleaned in a special way, as plexiglass can scratch easily. This makes non-abrasive cleaning methods absolutely necessary.
Pour a small amount of kerosene onto a rag.
Rub the rag onto the paint stain until it comes off.
Mix 1 teaspoon of gentle soap with 1 cup of warm water in a bowl.
Dip a sponge into the soapy water. Squeeze out the excess moisture.
Rub the sponge onto the plexiglass to clean off the kerosene.
Rinse the area with water, and dry it with a paper towel.