Goof-Off is 100% xylene and is available at Home Depot and other home improvement stores. It will cut ureathane caulk such as Vulkem very quickly using wiping rags, but is a very *hot* solvent and should only be used in a very well ventilated area (unless you're using an appropriate respirator) while using appropriate gloves (such as PVC gloves). Naptha will work as well, but slightly slower than xylene.
I haven't tried either on the plasti-coat to see if the plasti-coat will be affected, so you might want to try a small area first to check for any effect on the plasti-coat.
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