After each playing, wipe the horn down gently with a clean, soft ultrafiber cloth. Wax can help protect the lacquer, and if you want to use it, it should be applied after each time the horn is bathed - Dawn dishwashing detergent is one of the best for cutting grease, and Renaissance wax works best for me, with Butcher's second. Don't forget the interior of the horn; Blow Dry Brass is a good product to use, but at least use a swab through the tuning slide and leadpipe after each playing, and let the horn dry thoroughly before closing the case. That's good for the lacquer as well. Enjoy that horn. I've had no problems with professionally done chemical cleanings or home ultrasonic cleanings (a good machine, low temperature, gentle frequency, short time), but a lot depends on the condition of the lacquer, and you can definitely lose some to either of these processes. I've been lucky. When I get a horn where the previous owner wasn't so lucky, I've found Mark Metzler and Robb Stewart to be about as good as they get when it comes to replacing the lacquer. An afterthought: those Lifton cases, like the one you have, fit the horns well. While it's not strictly lacquer-related, I've had a few vintage Olds horns (SR and Recording, would have to check records for the others) which had suffered some case wear in the area of the bell engraving. A few decades of putting the horn in and out of the case can do that. It's not very expensive to have the engraving retraced while you're having a horn refinished, but a soft bag for the trumpet can help minimize the problem. For a lacquered horn, the silver cloth anti-tarnish bags don't offer any benefit over any untreated cloth, nor do they hurt. It's all part of the general lacquer care process: clean, dry, protected.