We just moved into a townhouse with a large holly tree in the back yard. Our patio doors have spots that look like water spots. We have had some success with Windex, Goo-Gone, and a razor blade. However, it is a very time consuming process. Since the holly tree branches cover the whole back yard, I can only assume that it is caused by sap or something from the tree. Might there be a specific chemical that can remove these spots?
By Richard
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There is a product in the automotive departments and stores that removes bug remains from windscreens. You might give that a try. It cuts through just about anything!
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