Personally I would avoid Brasso, Duroglit, etc., because eventually it will start to wear the lacquer off, also it is very messy stuff to clean off completely, especially in the nooks and crannies (which saxes have rather a lot of!). The only place I've used Brasso is very carefully where there's been a small soldering (blackened) flux stain on a joint somewhere on my alto, which after cleaning back I followed up with a tiny dab of clear nail varnish to prevent it blackening again a bit later. Other than that I treat my alto to a thorough external clean-up now and again (but at most only once or twice a year) using just warm water, a bunch of Q-Tips for the awkward bits, and a roll of kitchen towels for the drying off.
Generally speaking I don't think any amount of cleaning (even if all the lacquer is removed in the process!) will effect the tone. There was a guy playing alto on the beach the other day without any hint of lacquer left on his horn at all ... it was a sort of matt brassy colour all over, not a hint of shine ... but he was a dam good player.
As a guitar player I've noticed that those instruments, carefully 'stressed' at time of manufacture (to look 'well played') are quite in vogue! Maybe the same applies to horns, I guess there are lots of people who feel uncomfortable being the only person with a shiny new one!!!