I have a couple of department store 60mm refractors that make good "beater" scopes, since I don't mind tossing them in the trunk for unplanned observing sessions. Both have plastic rack & pinion focusers lubed with that awful axle grease that feels like cheap glue-stick glue and gets on everything if you make the mistake of touching it while moving the scope. Has anybody had any luck cleaning these things up and relubing them with something less offensive?