cable connector cleaner/contact enhancer

I have found that the following in some capacity achieves "cleaning".

(1) I use bare speaker wire. Perhaps once a year or so I will clip off the ends and create newly unshielded ends.

(2) in the case of rca or xlr, simply unplug and replug the connector. the "re-seating" tends to be desirable every so often, albeit infrequently.

(3) rubbing alcohol if some foreign matter is visible on the connector

I spray deoxit D5 from time to time over the bare speaker wire ends on amp side and on speaker side.

Anyone use Kontak? 

I've gone through a couple bottles of Kontak over the years.  Like it, works great, but is just too expensive.  Caig DeOxit D5 cleans just as well at a fraction of the cost.  Alcohol can be used (although the D5 is far more effective), but stay away from rubbing alcohol which typically contains lanolin and/or other skin softeners that will leave a film.  Use a 95% or higher purity isopropyl alcohol instead.

bcowen, I agree with you on the rubbing alcohol. I mentioned "rubbing" alcohol previously but yes I too look or isopropyl or a high purity alcohol. Everclear is a pretty good choice :)
https://en.wikipedia.org/wiki/Everclear_(alcohol)