How often do you clean cables? And which types do you clean most often?

Doug, I suggest that you also clean the amp & speaker binding posts as part of your comparison. I will be amazed if you don’t hear an meaningful improvement. Then work through the entire chain of ICs, fuses, tube pins and sockets, AC prongs and receptacles. I didn’t mean to suggest that dirt or tarnish on a Q-tip is a substitute for close listening or ABX testing. But its evidence will correlate to improvements that you will hear. If I understand your remarks so far, I am frankly surprised to find a pro reviewer who dismisses basic cable hygiene and maintains that the mechanical action of frequent equipment and cable swaps is an adequate alternative. Dirty connections can be the weakest link in a system and can skew an equipment or cable review as one chases equipment to compensate for the lifelessness, creeping malaise, and loss of transparency that accompany oxidation and crud.

silver is unique
 in the sense that when it oxidizes conductivity increases fact!

My suspicion would be that if I have cables that have been used regularly and do not show obvious signs of oxidation they would not sound appreciably different in comparison to an identical cable which has been cleaned. 

Agree or disagree? I do plan on testing it informally.