[KillaCamST]

I took this advice from someone on this fourm and it work to perfection.

First I washed the car with dish soap to get rid of all the wax, then I used a claybar(mothers) instructions are on package. But take your time when using this, it's the most important step.
Then wax/poslish the car (I used auto glym extra gloss protection) i don't use a machine to wax or polish because it leave light scratchs.
I have a black car and this process looked great.
hope it works for you