Yesterday I washed my car and immediately dried it. I was applying the first coat of Z2 and about halfway through the applicator began turning gray then black! I cant imagine that there was black grease on the car after my wash. When I applied the Z5 and Z2 again in a 2nd and 3rd coat, the applicator remained white. Does anyone do a 2nd wash to prevent this? I feel that my wash process is VERY thorough.