What solution to clean silver and gold contacts?


Hello!

          I am looking for a product to use to clean contacts in my audio system. Contacts are mostly gold plated, but some of them are pure silver on pure silver.
         I do not want anything that leaves any kind of residue / contact enhancement product. I read on forums that some members claim these products improve the sound at first, but later degrade it. So in the end, they removed all of the contact enhancement product from the actual contact.
         Right now I am mostly leaning towards using pure ethanol alcohol, as I think all of it would evaporate.
         Thanks in advance for all of your advices.
audiobb
rodman99999: You may be right. I always clean off the tarn-x with alcohol when finished. I've been using 25+ years and have not seen any pitting. BTW, I'm pretty sure the air, in an urban environment, has cancer causing substances. I lived in a Chicago house for 35 years whose shingles were pure asbestos (and flakey too). I'm sure mine wasn't the only one. Not trying to scare you or anything...
@dweller - My post was simply a quote, from the cited article(close to the end). Happy listening!
AudioQuest told me directly that tarnish on their silver-ended wires has zero impact on sound.  I've found that their silver-ended cables do tarnish slightly over a good amount of time (it IS silver), and if for some unusual reason after a good while I have them off and it's convenient, I'll remove the tarnish with a standard silver polish (Wright's Silver Cream)--very easy to do.  Of course I'm meticulous about being sure every trace of the polish is removed before reinserting.  But based on their guidance, I don't really care about it and could go probably indefinitely without paying attention to it.
Silver does not form an oxide layer. In fact it is very difficult to oxidize silver under ambient conditions. The black tarnish is silver sulfide which affects the conductivity. Depending on the amount of sulfur in your local environment, silver can form a mono layer of silver sulfide in a matter of minutes.