It is equally important that you also clean the interiors of your car whenever you wash it. Just vacuum and sponge your car’s interior each time. Because the dirt particles are erosive in nature, and also if there is any spilled liquids like soda remain in the car, it is corrosive as well.
You must vacuum the interiors by using a powerful vacuum cleaner because the small cordless models are not as strong so as to give it a proper cleaning. While you vacuuming, use proper wand heads. In case you are using a bare metal wand, it may result to some mark and scratches.
At last, you must sponge the vinyl surfaces of your car with a solution using water with mild detergent.