[Boatanchors] Cleaning a bandswitch

[Dave Sublette]

My beloved Drake 2B has quit operating on a couple of bands.  I suspect
that a few positions on one or more of the bandswitch wafers need cleaning.
Q-tips, isopropyl alcohol and spray contact cleaner come to mind,  But is
seems to me that a very thin bladed burnishing tool for relay contacts
might also be called for.  I know caution is in order so as not to file
away the surface area of the delicat blades and fingers.  What other
techniques might you know of?  I am not anywhere near to being a
competent restoration tech.  I know there is a valued source of info here.
What say ye?

Thanks and 73,

Dave, K4TO