If you're going to wash then clay a vehicle is it necessary to strip the existing sealants chemically before beginning to polish?? If so, what is recommended and at what dilution ratio?? Thanks!
the polish itself should strip and prep the paint for your wax/lsp.
now if you are just interested in swapping lsp without polishing or correction, i believe that would be when you would use a chemical stripper like griots paint prep.
im sure others will confirm and provide additional guidance.
A thorough washing is always a good idea before before claying and polishing. Mix up your regular washing solution and add about 1/2 of all purpose cleaner. This will remove most sealants and waxes.
Personally speaking, a dedicated stripping step isn't really needed as washing then claying will remove most of what's left.
Because polishing is abrasive, it will remove anything missed but the clay step.