Hi Bryan It is a type of silicon grease ( NOT heat sink grease ). It is not really a cleaner but unlike petroleum grease, it has vary low film strength. In other words, it is a poor lubricant. When the contacts scrape together, surface oxides are scraped off and the grease protects the new surface from degrading because of air contact. There are similar products sold through hi-fi shops but I've been using DC#4 ( Dow Corning #4 ) for a long time and trust it. You can get it at many electric shops ( you know lighting and wiring ) as well as mail order, like McMaster-Carr. In a pinch I've had good luck with automotive products like SilGlyde grease and other dielectric greases. It is good for most any electrical connector since it is non-conductive. It works best on connection that carry High current, like power supply connectors. It also works well on connectors that have vibration issues, like the RAM pack connected to the back of a Sinclair ZX81. It does lubricate slightly so one should make pins on things like EPROMs at 90 degrees relative to the package, so they don't have spring tension that tend to pop them out of the sockets. This is probably a good idea to do with plastic ROM packages as well for reliability reasons. Stressed pins, from automatic insertion methods, tend to increase the likelihood of pin to chip failure. Dwight