*mj09: you could try either Mothers or Megs Step 1 first, if this does the trick in removing the stains then your next step would be applying a wax, that or if you want to improve the gloss you could get their step 2 as well, you don't have to get the step 3 as the final wax, you could get other waxes you prefer or use what you have on hand but it would be great to get Step 3 since they are formulated to work together as a 3 step system. If Step 1 doesn't remove the water mark stains, you might have to get a real polish for that, so you might need SwirlX or Mothers Scratches Remover, both are great in polishing the paint and removing certain defects and stains. If this step still doesn't do the trick then you might need to machine polish it, or worse it might mean compounding, And then after that be sure to apply a durable wax during the rainy season to avoid getting them back again.