[Hallicrafters] Tuner Cleaner (Radio ShacK)

[Clayton L. Nicolsen]

One other important point about using spray tuner cleaners...

As you already mentioned, spraying it liberally on wafer switches, 
especially old ones, can be a problem as it can frequently cause the wafers 
to swell and the switch won't work properly.  As a previous thread stated, 
use some alcohol to remove some of the solution from the wafer.

However, a bigger issue is the tuning capacitors.  Never, never spray any 
kind of contact cleaner that leaves a residue on tuning capacitor fins.  
This will change the dielectric constant of the capacitor and dramatically 
change the alignment of the radio.  You also will need to clean the tuner 
residue from the capacitor fins.  The alcohol will work, or you can use any 
commercial spray cleaner.  Keep it out of the shaft bearings.