There are lots of ideas at http://www.macosxhints.com/article.php?story=20060210115417864 http://www.macosxhints.com/article.php?story=200602101154178... (first

There are lots of ideas at http://www.macosxhints.com/article.php?story=20060210115417864 http://www.macosxhints.com/article.php?story=200602101154178... (first hit from http://www.google.com/search?q=Mighty+Mouse+with+the+scrollball+that+you+cannot+clean http://www.google.com/search?q=Mighty+Mouse+with+the+scrollb...). Most of them seem pretty close to Apple's suggestions at http://support.apple.com/kb/HT1537 http://support.apple.com/kb/HT1537 - sometimes with alcohol instead of water. Mine hasn't needed cleaning yet, but it's less than 12 months old.