Its a fabric top and the only chance I think you have is 303 Fabric Guard in the GREEN label. I apply two heavy coats spaced 3-24 hours apart, depending on humidity and temperature. I use 1/2 bottle per coat and work it in with a detail cloth SOAKED with 303. I call it "The AUnt Jemima Treatment". Keep the stiff off the finish of the car with trash bags secured with masking tape, and use rubbing alcohol to clean if off the window.