[Chuck Schwark]

I hope you did not spray the contacts on the bandswitch, but used a Q-tip or small applicator to just the metal moving and stationary contacts.
"Flooding" the phenolic wafer structure can cause problems at high frequencies. The phenolic wafer sections will absorb and hold the contact cleaner. De-Ox-It leaves behind a lubricating compound and does not totally evaporate like other contact cleaners. This may cause stray capacitance between contacts on a wafer section and cause possible de-tuning and alignment problems.