When I stripped all the brass (off the boat) I used proper paint stripper. After a lot of searching I found it on E Bay. I think I became a business for a day😇. Far more difficult than the stripping was the polishing afterwards. You name it, I tried it. The most effective were buffing wheels and buffing compounds on a 6" bench grinder. Other methods tried included (in no order of effectiveness) polishing bobs in electric drills, Dremel with mini buffs, wire wool, fine wet and dry, car buffing compounds, Brasso, valve grinding paste, Finally - swearing😇. It took me over 80 man hours to get a reasonable result.
Assuming that you intend to lacquer the end result the only advice I would give is to steer clear of a (very expensive) product that claims to be "many times harder" than diamond (can't remember it's name). Despite following the instructions faithfully it never hardened properly.
Good luck.