No matter how careful we are, carpet cleaning is a must for oft-used vehicles. For stubborn stains, use a soft-bristled brush to agitate deep down into the carpet's fibers, using circular, overlapping motions. Finally, blot the moist area with another clean terry cloth towel. Although most spray-on cleaners leave no residue, vacuum again once the carpet is completely dry for best results. Finally, some cleaners also contain a protector, but applying a standalone protector to the newly cleaned carpet will help future stains come out even easier.