cable connector cleaner/contact enhancer

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)

Use Kontak here. But my research led me to believe that the lack of residue, over time would be worth it. 

Thanks all for weighing in.  It seems that most of your comments are in favor of cleaning contacts as opposed to conditioning.  I think that is the best way to go.  The less product between connectors the better.

Kontak and Stailant 22.