Agree, you need to know the difference between one product & another. The multi purpose cleaner waxes don't last. They are great for getting light oxidation off but for protection that lasts a sealant of some type needs to be used.
There are plenty good ones out there. My product of choice is Meguires Flagship. This comes from many many years of saltwater kept boats before the RV came along.
It helps also if you have the right weapons, tools, for the job. Mine is a Makita polisher. One heavy brute of a machine but very effective.
