Topic: Oxidized Ports? Defective Contacts, loosing low frequencies...

Dear RME team,

i'm sure it's not the fault of my beloved rme multiface II unit itself, but the outputs on the back side got a little discolored (white-ish)... I#M struggeling with defecive contacts (monitor outputs) in the way, that I'm recognizing loosing some low frequencies...
I don't know if I just should buy new cables or is there some kind of liquid or spray I can use on the rme-connections itself?
what do you recommend?

Thanks for helping out!

Best wishes,