Acid rain will eat away at your car's paint, polish and finish if you do not remedy the situation on a regular basis. If your car generally is protected in the garage, then it may only be necessary to perform this task once or twice a year. However, if you live in an area where acid rain is a problem and you cannot store your car under cover, then you should treat acid rain stains as soon as they appear, and also use this treatment technique to forestall new stains.
Wash your car thoroughly. Use plenty of soap and soft, cotton cleaning cloths. Make sure that all dirt and grime are off of the car so that you can more easily spot problem areas.
Dry off your car. Use clean, dry rags to remove all moisture. You might want to let the car sit for 45 minutes or so after drying to insure that it is completely dry.
Wax your car. Generally, this will involve applying the wax with a clean, dry rag, then buffing off excess wax after a manufacturer-specified amount of time. Use heavy pressure and circular motions to make your car shine.
Inspect the car for acid rain stains. In many cases, the washing and waxing will have removed minor stains and acid-rain related issues from the finish.
Treat remaining acid rain stains with automotive glaze. This is a polish that will fill and remove etching and scratching caused by acid rain. Rub on the glaze using a clean, cotton cloth. You will need to use moderate pressure to work the glaze into the surface of the car until you see only a light haze. Buff this haze away, and your acid rain stains should be gone from view.
