Using a Heat Gun and Scraper works but is slow going. You can also try grinding it off but will gum up the works if too much friction heat is generated.
Possibly, removing a few pieces and submerging them in various solvents; Lacquer Thinner, Denatured Alcohol, Shellac Thinner, etc. and maybe Liquid Paint Remover to see if any have an affect on the Schutz, will be helpful. Be careful though, I have no idea if a sudden reaction may take place.
Ray