I used to fool around with harmonica playing about 30-35 years ago and then lost interest. Recently I found 2 of my old instruments, a Hohner 364 and a 365, both in C and made in Germany.
The 364 is OK but the cover plates on the 365 have quite a bit of rust on them. I called Hohner about parts and they told me that new covers are made of stainless steel but mine are the older style that are nickel plated. I know I can buy new plates from Hohner ($22 + shipping) but truthfully I can buy a high condition 365 on eBay for that (in fact I just did get a 40 year old G for less than that).
Tried to attach a picture but got message file was full.
Any recommendations about what to do? Just use steel wool and try to keep it clean and dry? Does anyone ever use any type of wax and buff on the metal to prevent rusting?