I discovered on day simply because I had nothing else available that ordinary white spirit that you clean paint brushes with cleans my trackball quite well.
I just pour some into the bottle lid and drop the trackball in and leave it to soak for a few minutes.I then dry it off with a dry cotton bud and put it back in.My current trackball has been cleaned a few times with this method and is still going strong and I suppose that any mild solvent that won't attack the plastic might do the job.
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Please note:No Blackberrys were harmed in the making of this post.
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