Okay, so I have very bad water spots on my black stang, so I decided to buy Mothers california gold clay bar pack, with the showtime lubricant, 2 bars, and microfiber towel. I wanted to test on my hood, so I flattened the clay, lightly sprayed my hood, and the bar one spray on that, then made about 4-5 section passes, and as I looked closely, the clay wasnt fixing all the water spots, I could tell both as I was doing it, and after I wiped it clean. Could this be because I previously lightly waxed over it? Maybe also because I washed with a wash n wax (meguiars)?? or do I just need a more aggressive clay bar than that?