Not sure where you're at with the snare but if the problem is a fine, rough, raised pitting on the surface of the chrome then rubbing with aluminium foil and vinegar will work well. The foil is soft and won't scratch the chrome. It's also good on rusted hoops. If the chrome is flaking or perforated then there's not much that can be done. The pictures show a before and after. The foil did most of the work and I finished with a metal polish and wax. I actually used foil and water but I'm told that vinegar will work even better. Good luck.
If you weren't a fellow VDF member, I'd say your "before" picture was a stock photo off of the net of a basket case snare or that you were showing me 2 different drums.
That's amazing-jaw dropping awesome. Another gem saved! Too new to the rehab end, I haven't tried the aluminum foil technique yet, but I will....
I'm 100% over-joyed with my Slingy snare after a major clean up and a finish off with Simmichrome--all excellent advice from guys here. The snare is ready for a re-assemble and premier showing. All I'm waiting for to complete the snare project are new hoops from drummaker. ( I had no clue my wait could be very long. I hope I didn't make an error by ordering there...guys on here are pretty upset....). We shall see. Keep on Pl