Homeowners and renters can remove most paint stains using the following steps.
Boil equal parts of white vinegar and water together.
Wet a rag with the vinegar mixture. It is important to apply the mixture while it is still hot, as the heat helps dissolve the paint. Take care when handling the hot water, as it can burn the skin. Rub the hot, wet rag on the paint stain and then slowly rub the paint away.
If the paint does not wipe away, use the rag to scrub at the stain.
If the vinegar mixture fails to remove the paint, carefully use a razor blade to scrape the paint away. Sharp blades can scratch glass, so it is important to scrape lightly.
Dip a clean rag in paint thinner and rub it on the glass to remove any remaining paint. Read the label before applying, as some chemical paint removers can damage glass.