I second the Caig products. I use several of the incarnations of DeOxIt and ProGold. You can purchase them online at Audio Advisor, Music Direct and Parts Express. Parts Express generally has the best prices, but not always. In fact, [shameless plug] I clean the contacts, inputs and outputs on my preamp (that I am selling here) every six months with ProGold and every year with DeOxIt followed by ProGold.