Thanks to everyone for their input. I went out and bought a claybar yesterday from the local autozone, I got one made by mothers. I used it and had awesome results, took all the watermarks off. Just in time too as I get to go to a local car show this morning here in a few hours. Thanks again to everyone for your input.
2005 Ford Mustang GT *Black Sunshine*
Current Mods: head & taillight covers, red tri-bar pony floor mats, sequential tail lights, chrome skull & flame pedals, red wire covers, underhood billet caps/covers
1990 Ford Mustang LX Convertable *White Lightning*