WOLFGANG CONCOURS SERIES WG-9000 Elastic Detailing 200Gr Poly Clay Bar (1 Pack) Clay removes contaminants that are often too small to be seen with the naked eye, but they can be felt. Detailing clay works by gliding across the paint and picking up any debris that protrudes from the paint surface. Wolfgang Elastic Poly Clay helps you achieve a glassy surface that looks incredible under any wax or sealant.