Don't stop there. Clean all of the contact points in your system, including your AC.
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I don't doubt that cleaning corroded terminations will drastically improve the sound.
But we can't overlook the "oil change" effect.
I.E., my car always seems to run better after getting the oil changed (or a car wash).
My system really sounds good when I move it to a new house (or room) and spend an afternoon hooking everything up.
When my meat hits the seat and I have a few cool ones -Audio Paradise!
That is excellent customer service, the sort of service Richard Vandersteen is known for.
Question though, if the screw threads were showing corrosion, what about the screw receptacle? Did you clean those? I'm assuming corrosion caused by two dissimilar metals would affect both metals. Couldn't hurt to spray some Caig Deoxit in there.
Perhaps said facetiously, but in any case, I doubt Stringreen can be considered an audio novice and unlikely he wasn't aware the build up of oxidation products adversely affects sound. What's striking is the location of the corrosion and the significant beneficial effect of removing it ("not a tweak but a whole different system."). Makes me hope to discover some hidden oxidation in my own system.