How to Remove Hard Water Stains From a Car: Safe DIY Fix
To remove hard water stains from a car, wash and dry the surface, test a dedicated mineral-deposit remover on a cool panel, rinse it before it dries, and polish only the marks that remain etched. Fresh deposits usually take 15-30 minutes to remove; baked-in rings may require 1-3 hours of paint correction or professional work. […]