I've always used Meguiars with good results. But last week I had to take some overspray off 3 cars that were near a new industrial building when it was getting painted. Needless to say they got covered in overspray paint. One not so bad, the other really bad, and the last (a BMW) felt like 1000 grit sandpaper! The Meguiars clay just disintegrated when trying to get the overspray off. So we tried out our new Griots Garage Clay. It was very sticky so not as nice to work with as Meguiars, but man did it do an AMAZING job at getting that overspray off when nothing else was even coming close to having an impact on it. We even tried M105 and it wasn't working. The only thing I can think is since this paint was going on the inside of that a 150+ft. tall industrial building it was a much more resilient paint. I know this is an extreme case. Most situations you should be fine with most normal clays.