Liquid Wrench to the Rescue!

Well my rotary switch became very hard to turn and I left my spares at my house…. So I tried Liquid Wrench.  It actually started to work right away…. But the next day it was working perfectly.  I have never tried this before…. Not sure how I am going to clean it off though?  I just assumed it would not work and I was going to replace the switch the next day anyway.