Gunk WWCZ-1G-4PK Summer Windshield Washer Solvent - 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. Formulated with biodegradable ingredients Water based, non-streaking formula Contains no chlorinated solvents