Gunk HS3-4PK Hydro Seal Heavy Duty Parts Cleaner - 1 Gallon, (Case of 4) GUNK is a local family owned company based out of Charlotte, NC. For more than 75 years, GUNK products, developed by the people who use them, has earned the trust of hard-working tradesment and the active DIYer through consistent, superior performance and a commitment to innovation. Powerful, heavy-duty hard parts cleaning compound Special brightening agent gives a factory-fresh appearance Contains no carcinogens or chlorinated solvents Safe to use on all metals including brass, aluminum, chrome