so i'm planning on doing some polishing on an audi and a few other cars here in the near future and i'm trying to decide what polishes would be best to use. i know that audi's have a notoriously hard clear coat and i'm going to be using a pc so i'm trying make my product selection with that in mind. so on that note i've been looking at SIP/106FA by menzerna or maybe 1Z's pro line polishes. anyone have any experience comparing the two? the 1Z stuff is quite a bit cheaper then menzerna and i don't detail all that often so i'm trying to keep things on the cheaper side.