On Jan 21, 6:46 pm, "StellarTech" wrote:
". But do you know of
ANY chemical product that would behave similarly, I.e. penetrate to the
carbon button & contacts, that wouldn't leave a residue? I would be leery to
use any aggressive solvents

servisol and lubri-limp -proper contact cleaner (non residue).
Surprised as a tech you never used switch cleaner?!!