To the editor:
Do you have stubborn black stuff on your car that won't come off in the car wash? If so, I have the solution for your problem.
You will need:
1. A sponge that will provide a little scrubbing power but that won't scratch the car. I used the thinnest of the pack of four different types of scrubbers you can buy at the Dollar Tree.
2. Dawn dish-washing detergent in a bucket of warm water
3. Another bucket or hose with clean water to rinse small areas immediately after you wash them.
It took me very little time and effort to get my car looking like new.