I suggest usage of "Kontact", it can now be found on musicdirect's website, it is a dry-cleaner type chemical and leaves absolutely no residue and removes everything (except perhaps copper oxide on copper). I have been using this stuff for maybe 12 yrs or so and it actually makes an audible difference after you clean everything- do not skip power cords and plugs. Be forwarned it is a bit of work to clean everything, esp. interconnects. I use cotton pipecleaners and q-tips. I also use Walker's silver contact "paste" and have cleaned it off and re-applied it once, the second time I was careful to use very little as the first time I think I over did it a bit.
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