I know Claybar has been talked up and down this forum after all the reading I did, but I don't remember seeing this little tip. The other day I used it on my windshield and I couldn't believe the result! i did the drivers side, keeping the surface wet with Windex, and just moved in slow circular patterns. I felt the gunk being lifted off the glass. I then thoroughly wiped it down with some glass cleaner and I couldn't believe it. I had to leave the house for a bit so I was driving one side after claybar and the other side untouched, and the difference was amazing. I swear it was almost as if the passenger side had a gritty tint to it, and the drivers side was amazingly clear, even with the small scratches on the glass. When I got home I did the entire windshield, and finished off with rainex. Smooth as butter an it never looked better driving and looking into the car from the outside.