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Car wash brushes are obviously out of the equation, as the primary purpose of a brush is to agitate the surface using friction. Moreover, using a sponge to wash your car is never a good idea.

Car Wash: 100 Years of Brushes, Soap, Wax Shine and Elbow Grease. One industry is cleaning up as the weather begins to warm up. The car wash celebrates its 100th anniversary.

But I would say on average you'd be spending $8–$10 per wash at a car wash using god knows what on your paint," said Mr Luke. The good news is that it's typically not the end of the world.