There seems to be 3 schools on how to handle brass–don’t touch it, shine it up a bit, and polish the heck out of it. I’m in the second school, but am unsure how to preserve the shine. I’ve seen other brass-era cars that have mirror finishes sealed with lacquer. That’s a bit much IMHO, I’d just like to preserve the shine for a reasonable amount of time without having to buy stock in Brasso