What do folks use to clean cables/connections?

Grain Alcohol (if it's good enough for NASA, it works for me) and Detoxit.
Don't drink the Detoxit please,

Denatured alcohol has always been a good metal cleaner, (And optics cleaner also) is easily gotten, and might be a good product for step one. Naturally for cleaning connections-binding posts etc, I don't think one would have to resort to HPLC grade to get the job done.
One could then perhaps finish up with Caig Pro Gold? Mark

Another vote for Kontak. It's by far the best that I've tried. I clean everything every six months... interconnects, speakerwire, component connections, powercord connections, fuses, fuse holding "compartment" + fuse cap, and small signal tube pins-(when I was running a tubed preamp). It eliminates a haze that slowly creeps into my system over time. Benefits, for me at least, are better clarity, better dynamics and better low level detail.