I have not used it but just bought a spray can of Deoxit. From reading
about it, it seems to be the greatest stuff for cleaning contacts.

I have an old Tectronix Scope 465B that one chanel has a flakey input
switch. The manual says only to use isopropal alcohol to clean it
with, I did that with some 99% and it helped some, but thinking of
using some of the Deoxit on the switch. Would that be ok or not.

I would hate to mess up the switches as they would be almost impossiable
to find replacements for .