Our Self Serve Laundromat also offers a convenient Self Serve Car Wash, allowing you to wash your car while you do your laundry. Before washing your car, be sure to rinse it off to avoid scratching the paint. And remember to use only car wash soap, not dish detergent or laundry detergent. Waxing your car 3 to 4 times a year will help protect the paint and keep it looking shiny and new.