Prior to cleaning switch wafer contacts, which are rarely the cause of "stiffness," it would have been wiser to clean and lubricate the panel bearing and the switch position bearing mechanism. Those are metal parts and get stiff from dirt building up and eroding the lubrication. Now that the hydroscopic wafers have already absorbed the tuner cleaner and are swollen (?), to reverse that process may take a long time. (Actually, I've never heard of this, but it's possible with the pheonolic material Drake used.) But cleaning/degreasing and then re-lubricating the metal bearings is not complex. Use a small, stiff brush and some denatured alcohol on all moving parts and bearing surfaces (the metal plate that is part of the main switch mechanism), followed by a blast of air from a dusting sprayer and a tiny drop of electronic bearing lubricant (GC and others sell this stuff in tiny tubes found at electronic parts stores). Remember to try to clean the panel bearing as well, if you can access it (this is the thrust bearing mounted to the metal subpanel of the T4XB, through which the bandswitch shaft runs to reach the front panel knob). Hope it works!