Last week I dressed my mesh grilles with 303, all good, great result and finish. Today i washed the car using Werkstat Auto Body Wash. lovely to use, easy glide, and not frothing all over the place....BUT, i didnt really take too much notice before I washed how the mesh was looking but I am pretty sure it was still relatively black, but after i washed i seemed alot less black I diddnt specifiaclly wash the grilles as I thought i may contaminate by mitt with the 303. So my questions are: Will the 303 come off when washing with shampoo? Should I avoid getting my wash mitt over the areas that have had 303 applied, even though it was about a week ago? I dont want to have to apply 303 every week, works out expensive and unjustifiable!