Just hand or machine wash in warm water (about 40 degrees) with ordinary laundry detergent.
DO NOT use fabric softener.
Then either dry outside or tumble dry on a cool setting (NEVER warm or hot)
If excessively soiled, just soak in a solution of Napisan overnight, prior to washing
Today, approximately 90% of all factory finishes are clear coated. A clear coat finish is a multi-layer paint system comprised of a primer, a base coat (the pigment colour of your car) and a clear coat. Although a clear coat does protect the base coat, it is very sensitive to scratches and swirl marks because of its clear, non-pigmented layer that allows light to reflect through it.