Acetone is very good at getting anything off anything. Problem is Acetone will also eat paint off too, so if the focuser has any paint on it, forget it!
I once wanted to paint a motorcycle tank in a hurry and I was told that acetone was the best to degrease and strip the paint off. Luckily I was working in a Fibreglass place at the time and I filled a drum with acetone, stuck the tank in for about 20 seconds, swooshed it around and pulled it out to see if it had degreased it yet. It had stripped everything off down to the bare metal! IN 20 SECONDS!!!!
Good stuff!!!!!
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