(1) do NOT use an eraser. That will remove plating; that's much too abrasive.
(2) Pick a nice non-residue contact cleaner such as Kontact or Audioquest Ultraconnect.
(3) Get some pipe cleaners & cut into thirds. Did the pipe cleaner into the solvent & clean off the grunge. Repeat using a clean pipe cleaner. Pipe cleaners are mildly abrasive & will help to scrub off the dirt & oils. Remember your AC connections & speakers as well - clean *everything*!
Refer to this great link @Galan Carol Audio for more specifics in great detail.
http://www.gcaudio.com/Archives/howto.html
(2) Pick a nice non-residue contact cleaner such as Kontact or Audioquest Ultraconnect.
(3) Get some pipe cleaners & cut into thirds. Did the pipe cleaner into the solvent & clean off the grunge. Repeat using a clean pipe cleaner. Pipe cleaners are mildly abrasive & will help to scrub off the dirt & oils. Remember your AC connections & speakers as well - clean *everything*!
Refer to this great link @Galan Carol Audio for more specifics in great detail.
http://www.gcaudio.com/Archives/howto.html