Strider,The Methylene Chloride (dichloromethane) dose sound a bit over the top. As for the toulene based cleaner I only dab a bit on a cloth then wipe off belt marks and pin marks and maybe sometimes round my track to remove old oil. We are not talking about getting a bucket filling it with the stuff dropping in my ball in an enclosed space while smoking a cigarette here. Anyway I think as with most things in life moderation and commonsense are the key , a dab here and there will have no adverse affects on the ball the stuff evaporates strait away with out leaving a trace , so no chance of there being any residual affects of the ball getting softer and softer. I also use the stuff every day at work so it's unavoidable.
PS. Strider many thanks for the concerns about my health but I think I'll be ok