[sdiy] ARP 3-buss keyboards

[g m montalbano]

Does anyone have a RELIABLE method for cleaning the old 3-buss
keyboards as found on the early Odysseys & 2600s?
The things that work for j-wire keyboards (99% alcohol, Tarnex, etc)
aren't doing much of anything to remove the 30+ years of tarnish,
cigarette smoke, etc.
And it's hellishly difficult to apply any kind of pressure to those
springs without bending or breaking them.
What works for you folks?

Thanks.

~GMM