OK - so I've got some NASTY waterspots on the hood of my black WRX. I don't know how they got so bad, but generous application of vinegar and elbow grease didn't touch them, nor did a clay bar. After lurking about here a bit and getting some info from other forums, I decided to get myself a PC buffer (7336 at Lowe's was only $106 so I couldn't resist). I originally tried Maguires #2 "fine cut" by hand - I tried a small area, made a dent in the waterspots but left a really nasty trail of microscratches in my wake (OK, so there IS a reason it says for rotary buffers only!). So I went and got the PC and a bottle of #9 swirl remover. Note that I only have the original WHITE pad on the PC since nobody nearby seems to sell the others. I went at it for awhile tonight; 2 applications of #9 until it was "dry-ish" and now the scratches left by the #2 application are NEARLY gone and the outlines of the waterspots are still too obvious for my liking. Would a more aggressive pad (orange cutting pad?) help get the last of these offenders out? Or should I move to something more aggressive like one of the #80s? Right now I'm working with the products I can find at local auto stores which means #2, #7, #9. I'm going to try to make a run to the detailing supply place tomorrow AM before work though, since they close at 5 before I get off work. They would probably also have the other foam pads, I would hope... ?