DON’T wait for your car to be dirty before washing. Dead bugs, bird droppings, and chemicals from the atmosphere all carry acids that can eventually eat into your car’s paint.
DO rinse the surface thoroughly with water before you begin washing to remove any loose dirt and debris that could cause scratches.
DO use a dedicated car-wash product, which is specially designed for use on automotive paint and use a soft towel to dry off your car.
DON’T wash your car when it’s hot, wait a while after driving it or after it has spent time in direct sunlight. Heat causes soap and water to dry quickly, thus increasing the chances that spots or deposits will form.
DON’T move the sponge in circles. Doing this can create noticeable scratches called swirl marks.