I just disassembled a 1905 dated Russian 7.62x54r cartridge. The powder had obviously gone bad as it was green and clumped together and gave off an ammonia smell. Inside the brass case is uniformly corroded green. I would like to dissolve/remove/neutralize this corrosion without damaging the brass case in order to preserve it. Is just removing the powder and washing the residue out with water enough or is there more I can do? I don’t normally deal with cartridges this old, so this is a new endeavour for me.