As others have said unless it REALLY needs cleaning, don't bother. The corrector really has to be dirty to even consider cleaning. That said, I'll mention that during the recent rebuild of my C-14 I had everything apart anyway ( http://planet.state.ut.us/slas/patrickw/PATRICKW660.JPG ) so I said "oh the heck with it!" or something to that effect and removed the secondary housing from the corrector (it was loose anyway) so all I had was a large, round piece of glass. Into a sink of warm soapy water it went. Some light strokes with very wet and soggy paper towels (from center to rim with no circular motions), then a rinse with warm tap water followed by a couple rinses with a mix of distilled water and Everclear (40/60). Then let it air dry and picked off individual beads of water with the corners of paper towels. Reassembled and (believe it or not) it works! Needless to say this was done only after marking everything so I could get it all back the way it came apart. But again, if it's not really dirty, don't bother. Patrick