try Anti-bond
Here's the manufacturer's description:Antibond SprayThis product actually debonds polyurethane adhesives, removes paint overspray on cars, cleans adhesives and sealants off your tools, removes black marks from your boat and RV, and makes marine 3M™ 5200 nonpermanent. This revolutionary product is so technologically advanced that they are discovering new uses for it every day on these surfaces: metal, glass & fiberglass.Note: Do not apply to plastics.There's also a similar product called DeBond 2000:Cleans and Removes Adhesives and Sealants Used on and in the BoatUse Marine Formula™ to clean-up and remove these common marine adhesives and sealants:Features:Cured 3M™ 5200 and other polyurethane adhesivesCaulks & sealantsBlack rub marksMost graffiti and oversprayAdhesive residueLiquid nailsAdhesive film from duct and masking tapeWipe away excess spills of sealants and adhesives including 3M™ 5200Polysulfide sealantsWill not harm: gelcoat, clear coat, plexiGlass, awlGrip®, imron®The Anti bond is $18.95 for an 11 ounce aerosol. The De-bond is $15.95. Let me know if you'd like to order.Dave GroshongCustomer ServiceSailboatOwners.comToll Free 877-932-7245 ext.116, Mon-Fri, 9-5 Pacific.