Gunk BTC6 Battery Terminal Cleaner - 5 oz. (BTC6) 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. Neutralizes battery acid corrosion Cleans dirt and grease Prolongs battery life Convenient aerosol container