Chris,
The #2 and #3 are pretty harsh. If there are deep swirl marks in the paint then using one of them might be a good idea. If you have a scratch that isn't all the way through the paint then either #2 or #3 will help, but just to use it...the finish probably would not benefit much from it. If you are already happy with the results of the bodyscrub then let (previously) unloved cars be.

Hope this helps...Lee