I am sick and tired of cleaning, or attempting to clean out the roller ball on this mouse. It is just beyond me why such an advanced computer (my iMac) has such a temperamental mouse that so easily gets dirty and is not readily cleanable. I have several times tried cleaning this tiny mouse ball with alcohol but there must be something down deep in there that just does not want to come out. Why can't Apple make some sort of removable panel that will allow users to clean this thing? I am simply stunned that after all these years we still have to put up with this poorly designed (never thought I'd say that about Apple) mouse. I am just done with this thing. I have put an old Microsoft mouse on this computer. ARRRRGH!