I recently (last week) did a complete reworking of all the glass on the tC. The exterior received an application of the DP glass restorer product. I used a white polishing pad on the PC @ speed 3. Even though I washed the windows off during the foam gun wash 15 minutes before, the pad turned a light shade of grey from all the gunk left on the glass. The glass restorer certainly did its job! Next up was DP's new krystal vision cleaner. I applied via a cobra ww glass towel and it quickly removed the restorers residue and left a sparkling clear window. Afterwards I took the glass cleaner to the inside of the windows and everything was great! awesome products :-D