I applied it to the windshield, and when used, the white rubber part broke in one second from the root. I was surprised and watched a lot, but it was a defective item even if I saw it. In this case it is more effective when the windshield is frozen when rubbing with the card. I also thought that it was a problem with my usage, I tried purchasing again. The rubber part of the product is hard and not likely to be useful after all.