RE: How to clean varnish off a glow engine?
Besides using the crock pot method, I also use an ultrasonic cleaner with water and dish washing soap. This really cleans the pores of the metal and really gets bearings clean. But after I flush the parts with clean tap water, I place the parts in the oven at 250 to quickly drive off the water, then oil with either after run or Marvels tool oil.