Remove Extra Strength. RILEY'S REMOVE EXTRA STRENGTH ACID RAIN / WATER SPOT REMOVER is a professional grade acid based water spot remover that is extremely efficient in eliminating those dreaded water spots and other contaminants on glass and painted surfaces. Our water spot remover can be used on both glass and painted surfaces as part of the chemical decontamination process to allow for a quicker mechanical decontamination and a better paint correction experience. Directions : 1. Give your car a good wash to remove surface dirt. 2. DO NOT DRY your car. 3. Apply our water spot remover in a cross hatch pattern to a WET surface. 4. Rinse immediately *By request/order.