I have been using 303 pretty much lately, but did a C5 last week and it needed alot of 303 on everything, the black interior was very much neglected. When I was finished, the car smelled too much of the 303 (it smells like BO to me) and when I was done I ordered a gal of CG Silk Shine, hope fully its what I am looking for. I also have 1Z's Cockpit Premium, but I reserve that for the VW/Audi Soft touch dash/Interior. I find that the Cockpit Premium is uber-matte, like nothing is there at all, just looks new.