[Amps] Contacts Cleaner

[Joe]

I have been bringing an old SB-220 up from the grave with a 220 volt variac.

Ever soo slowly.  But one think I have noticed is the multi switch is 
very flakey,

it will read the hv but only with a lot of wiggling

what does everyone recommend as far as a cleaner and best way to clean it?

Joe WB9SBD
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