Cleaning agents?

I second Dopogue's recommendation. On the basis of a post here on Audiogon I went to the Flitz website and ordered a sample for $5.00 shipping and handling (handling must be $4.20, because shipping was 80 cents; but I digress). It arrived (very small tube), I used it on everything (including those IEC inner prongs - stiff and bristly pipe cleaners needed here), and the sound was vastly improved. Airier, less sibilant, more coherent. In short, magical. I couldn't believe (a) the improvement; (b) all the black gunk you'll remove from apparently clean connections. The speaker spades, in particular, looked all shiny and new. BTW, I used up less than a fourth of that small tube.