Best combination I've found is to use is 92-97% isopropyl alcohol as a cleaner, followed by Walker Audio Extreme SST contact enhancer. If the contact is corroded, use Caig Deoxit followed by a thorough cleaning with isopropyl alcohol to eliminate the sonic residue left by Deoxit, then apply SST. (No suggestions to offer for the fiber optic cables, though.)
.
.