Love the old Z cars
Look at my pics in my profile, there are 6 pictures of my cousins 300zx in there. It's a mean machine. About $80k invested.

Another good polish that works well and is easy to remove is the "Nu-Finish" car polish. You use a damp cloth to apply and it comes off super super easy.

I will admit i've never tried Zanio products but I have heard from several people they work pretty well.