I now have nice, new fixed ports. While the windows were out of the boat I covered up the openings with 6mil poly and duct tape. I must have left it on a little too long because I now have tape residue stuck to the fiberglass. What is the best way to remove the tape residue without harming the fiberglass? Isopropyl alcohol just smears the mess around. Any suggestions? Acetone, MEK, TSP, CLR, LOL, RTFL, WTF?