Car Windshield Cleaner

I just bought a used car '88 was sitting in the sun for a few years. It has what looks like mildew and rust on the windshield and the sunroof I do not know what I can use to remove it. Any suggestions on cleaning the windshield heavy?

You can use toothpaste and a brush. I did it and it polishes the windshield, as he polishes the teeth.

I also put a little Rain-X on it after it has dried.

0000 steel wool will do, does and it works very well.