Use strong solvents that dissolve polyurethane.
Things You Will Need
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Soak a clean cloth in paint thinner.
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Rub the cloth over the polyurethane stain on the glass. Work until the stain is completely soft and is gone.
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Rinse the area with water.
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Soak a clean cloth in acetone.
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Rub the acetone-soaked cloth over the stain until it is completely gone.
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Rinse the area with clear water and dry it completely with a clean cloth.
The Drip Cap
- Polyurethane is a type of varnish that protects wood from water, stains and scratches.
- Always cover surfaces in your home when you are using polyurethane to prevent it from dripping on glass surfaces.
- Rub the acetone-soaked cloth over the stain until it is completely gone.