Quoted from dozer1:Aprons or shooter lane spring gauges should never get a bath in the UC. PF plastics can't be thrown in to soak or they will loose some art or warp fairly quick. In my experience though, a couple second dunk, rub with fingers, and water rinse, will clean cig smoke residue off plastics better than anything. Experiment on old plastics that you might otherwise throw away.
Avoid cleaning leaf switches with fish paper in them. The fish paper will never be the same.
I also don't put micro switches in.