How To Remove Polyurethane From Glass?

How To Remove Polyurethane From Glass? Soak a clean cloth in paint thinner. Rub the cloth over the polyurethane stain on the glass. … Rinse the area with water. Soak a clean cloth in acetone. Rub the acetone-soaked cloth over the stain until it is completely gone. Rinse the area with clear water and dry