this keyboard may need to be cleaned.
textured dirt
let's try a melamine sponge and a little water
that cleaned up quite nicely!
much better
even the edge is nasty, wow
it's an IBM model F from 1984, so it has many years (and layers) of encrustation.
how do you get dirt on the *sides* of the keys? it's impressive, actually
neat! the circuit board inside has an SLT module inside (technically MST since it's probably a monolithic IC inside)
soapy water and the melamine sponge took care of most of the dirt on the case.
this stuff might be paint? fingernail polish? maybe red ink from a ballpoint pen?
pulled off all the key caps. time to make salsa
here's the key cap salsa. ingredients: water, filthy nasty key caps. season with dish detergent crystals.
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