[scanspeak]

The glass on my E92, especially the rear, is terribly water spotted. This is an area I have no experience with.
Here's the removal process I have in mind :

1. Wash car and clean with a good glass cleaner.
2. Clay bar.
3. Use a chemical water spot remover. Vinegar?
4. Use a glass polish for any remaining spots. Meguiars?
5. Seal / ceramic coat.

Can anyone suggest products for each step? I am looking for good value mainstream products (eg Meguiars).