Tonight I did a test panel on a 1999 F350 with SEVERE water spots. Truck has never seen anything more than an annual hand wax of an OTC brand "x" cleaner / wax. I can't seem to post any pics for some reason, but as expected the M105 / 205 combo worked great. D300 / 302 was a not so close second, but it was expected. These spots are really bad. The D151 did nothing for the spots, but did give the paint a lot more depth. I will post pics on my website it you want to take a look at them....
Whole area was cleaned, clayed and each area had a 3 minute run with a Griot's 6"DA. Foam cutting pads for the M105 / 205 combo, D151 and MF cutting pads for the D300 / 302.