I would go along the lines of what Mr. Phillips posted in the thread "Stripping the wax? Necessary?" If you have been layering the wax for a while and have not removed said layers in a while, I would go with a mild cleaner like adding some Dawn to your car shampoo/soap and then use the Pinnacle Paint Works Cleansing Lotion; since you are going to start using the Pinnacle line of products exclusively. If you are going to be working on removing water spots as well preparing the paint for wax/sealant then a light polish would suffice as Mike said. If you just want to remove the previous product and get right into using the new product then IMO using a mild cleaner soap that will break down a wax would maybe be more ideal for you case. It all depends on how delicate you want to to be to your paint and trim(you may not want to remove the protectant from you plastic/rubber at this time), and how clean your car is already. The PPCL is intended to remove and previous product and any light marring, and may, or not, remove water spots depending if they have going through your LSP. I would go with the recommended test spot with a wash of your choice to remove the prev LSP, and a test spot using a light polish or paint cleansing lotion and see which gives you a warm and fuzzy result.