I use Super VRT. And, lots of it - well, more than I think it ought to take. I have tried other products before Adams and like Curtis reported, the dash and door panels looked blotchy or streaked. It looked like a 6-year-old boy did it and was in a hurry when he did it.
I use the VRT, let it set a bit then wipe it down with a dry m.f. for the best results. I don't know why the vinyl is so much different than other Chevys but it is. It used to be that if I didn't stay on top of it, some of the dash and passenger door panel would get a chalky look.