McKee's 37 Xtreme Water Spot Remover Gel is a thick, acid-based gel that quickly and effortlessly dissolves stubborn water spots from paint, glass, chrome, and other vehicle surfaces. This fast-acting formula completely removes the water spots before they cause permanent damage by etching the surface. Besides multiple uses around your automobile, Xtreme Water Spot Remover Gel can be used around the household to remove calcium build up from glass shower doors too. This high-tech formula is 100% abrasive free and instead relies on advanced chelating agents and clear-coat safe acids to restore a sparkling, spot-free finish.