Now that I've verbally abused you for your past misdeeds, let me help you achieve redemption. Let's examine the process of cleaning in detail, investigating available cleaning agents and the application techniques necessary to insure optimum results. The perfect solvent would scrupulously clean the surface, leaving zero residue. Over the years people have used a wide variety of solvents to clean their connectors, a few work well, most perform quite poorly. While there are many products available designed to clean the contact surfaces of electrical connections, few have found favor with the audiophile community.
Isopropyl alcohol is an inexpensive option, but the improvements it offers are minimal at best.
Octyl alcohol is a bit better, but still not great. Freon TF works quite well, but this chloroflourocarbon is being phased out due to environmental considerations. Out of all the products I have used, one stands as the clear winner - Kontak. This revolutionary product from England comes to us via the aerospace industry, originally developed in conjunction with the Royal Air Force to clean electrical contacts in aircraft avionics. It is simply the most effective product I have tried, and by a wide margin.