We recommend using a specialty automotive car wash instead of dish soap, as some dish soaps can strip the wax and damage the car's finish. Car wash soaps are specifically developed for automotive paint surfaces, so you can be sure you won't cause any damage while washing away dust picked up from the road.

Mixing an ounce of dish soap per gallon of water creates a powerful car wash shampoo that can remove most contamination from the paint or glass. Bug removal – Mixing an ounce of dish soap per gallon of water will provide enough strength to remove a moderate accumulation of bugs.

In the photo you see a self-service car wash in Dallas Texas circa 1970 (50 years ago). Gas was 27 to 29 cents a gallon and you paid 25 cents and got 5 minutes at the self-service bay. Back then all they offered was soap and rinse.