We had a jobber pull into the shop about 2 months ago. I knew him from my previous job at another shop where the owner was always an immediate "no." I figured Id give him a shot. He had us grab our best Wurth penetrating oil and a foam coffee cup and fill it 3/4 full of water. He took the lid off of another aerosol, where there was a smaller center cap inside of a larger one. He filled the inner cap with Wurth, about 2-3 ozs, and overflowed a little. Dumped it into the cup, and waited. Nothing. Grabbing his, he filled the same inner cap about halfway up, 1 oz, and dumped it in. The water started rolling and within 10 seconds it had eaten the bottom of the cup out. It has proven itself in the few months since then, and Id highly reocmmend it to anyone who comes across it. They also make a really really really good set of drilll bits. Once again, theyve proved to be the best in our automotive shop.