Sure, this idea is nearly as old as the automobile itself, but it is a sure-fire winner. Be sure to stay out of the dollar store and instead seek out high quality products such as those from respected brands like Mother’s or Meguiar’s.
Don’t limit yourself to soap and sponges either. Caked-on tar and bugs that won't scrub off with regular soap can make cleaning your car all sorts of unpleasant. The folks from Turtle Wax have designed this heavy-duty power foam cleaner specifically for stripping that grossness from your front bumper. Once the car is clean, one may notice faint scratches and swirls in the paint. If they are on the lighter side, Meguiar's ScratchX 2.0 can be used to lightly buff out these marks by hand, returning the paint to its natural glossy finish.
DIY Car Wash Tips