I don't think I have the system to notice substantial improvement, but I think audioquest cleaner via amusicdirect is a good deal, around $10. AQ's wrench is about the best $8 you can spend, too.
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Ohlala is right. Audioquest is a good cleaner. You might want to follow with TC-2 contact enhancer by Torumat. Also try TPC wipes from Roger Skoff of XLO co. It is a cleaner/contact enhancer in one. They are individually sealed and go for a buck a wipe. It does make an audible difference. Happy Listening! John
The audioquest stuff works good for cleaning really dirty connections, but I think it is more than 10 bones. The xlo wipes are the ones that I have found to make the most audible difference, and the progold seems to be not quite as good. The audioquest, I find, doesn't sound as good as either. I haven't tried the sumiko contact but I am curios.
I would not be without contact cleaner. The difference a clean vs. dirty connection is important for sound quality.
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.