Windows

I have a 96 z28 with hard water spots on the windows that will not come off. My cousin said i might try a cleaner wax is there any truth in this and does anybody know of any other way to get them off. Also i have a little trouble with swirls after waxing any ways to fix that? i dont use a biffer i hand wax.

thanks

You can try using vinegar or very fine steel wool.