I recently picked up some Dunlop 65, so I'd like some pointers or advice about it. What exactly does it do? I understand it's only for the finished parts of the guitar, and it'll help get gunk off and return it to a bright, glossy sheen? Does it protect the guitar finish from fingerprints or anything like that? How long will it last before I have to reapply it?

Can I use it to clean the metal parts of the guitar? I have the dark nickel hardware if that's important.
Use it only on the finish. I've only used it a couple times, I just use my dad's buffer that he uses for his motorcycle to clean my guitars.
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