I just received a used gold plated Guardala Crescent mouthpiece in the mail from wwbw.com and when i opened it i found it covered in tarnish with a whole bunch of black spots every were. I played it for two hours and it played great but when my parents saw it they insisted on using tarnish remover. We used a cloth that has a very weak chemical in it and wiped it down getting rid of almost all the spots. It looks a lot better now but I'm worried I may have ruined it in some way, could using the weak tarnish remover have negatively effected it in any way? Thanks in advance.