[SPARCbook] Keyboard cleaning

[Emanuelsson Paer]

Hello,

I finally "repossessed" the Sparcbook-1 I bought back in '92 -- a
happy reunion indeed!

Now I find that the keyboard (which never worked really well) is
completely unusable, so I'd like to clean it.  I pried off all the
keys and it seems straightforward enough to clean; the question
is what cleaning solution to use?

For those who don't know the keyboard but might have information
concerning similar designs, the keyboard consists of a big rubber mat
with a ring coated with some conductive material for each key.  This
ring is pressed onto a thin plastic foil where it connects the row- and
column-encoding lines.  So, what should I use to clean these two parts,
without wiping off the conductor stuff from the rubber, etc?

Thanks, Pell