Gunk Liquid Wrench L508 Heavy Duty Spray Lubricant with PTFE - 6 oz. LIQUID WRENCH is a local family owned company based out of Charlotte, NC. For more than 75 years, LIQUID WRENCH 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.