I used masking tape on my plastic Jaccuzzi windows before I painted them. But now I cannot get the masking tape glue off the windows. I have tried everything (WD-40, Window cleaner, nail polish remover, lemon juice, vinagar, gasoline, etc). The windows sat outside for about 1 month with the masking tape on. Is there any solvent that will easily remove the masking tape glue without etching the plastic windows ? Any ideas would be appreciated. Thanks