Meguiar's® Marine/RV Hard Water Spot Remover is specifically formulated to chemically break down and remove hard water minerals off the surface. This thick, low drip formula remains on vertical surfaces for convenient cleaning, wiping off clean and easily. Other competitive products require extensive wiping and buffing to remove residue. It will also help protect from future hard water spotting. Hard water deposits bond to gel coat and painted surfaces and over time will dull shine and accelerate oxidation. If surface has been etched from prior hard water deposits, use Meguiar's® M67 Marine/RV One Step Compound or M49 Marine/RV Oxidation Remover to remove the defect.