Gunk TW64 Tough Series Concentrated Truck Wash - 64 oz. 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. Concentrated wash Removes tough dirt, mud, clay and salt from your truck or SUV Clear coat safe Foam carries away particles that can cause scratches and swirls