Good Lord, You polish and wax speakers just like any other paint (after it’s cured) I make sure they’re are not surfaced scratched, I fix that first, then apply a HARD coat of natural wax, two coats will do. Make sure the wax is Carnauba Wax (VERY HARD) NOW buy Pledge Furniture polish.
Its PURE WAX, no additives (read the label it’s PURE wax).
A light spray on the clothe and on the base once a month. NOTHING will stick for one thing, and if it does, a slight brush with a feather wand will remove it.. I have 16 year old speakers that look like GLASS, Top to bottom...BLACK Laquer, and two sets of polly dips, BLACK. They are better mirrors than most of my mirrors.
I know how to finish and take care of paint...
I use to paint a lot... Now I don’t take the chances because of exposure, old lungs and chemicals don’t mix. BUT waxing the furniture sure keeps me in shape....:-)
I'm doing a TT plinth right now in high gloss black, in about 6 weeks it will get final 1200 blocking, a quick buff out with 2000 liquid compound and wax applied.. GLASS....
Regards