The best way I've found of cleaning the scroll ball is to spray a small amount of iKlear polish onto it then turn the mouse upside down on a paper towel and push it forwards and backwards a few times. Seems to work much better than just rolling it on paper.
I love Apple, but MightyMouse is definitely crap.
I have gone through about five since they came out. It's a poor design both ergonomically and from the point of view of service as well. They are virtually impossible to clean or take apart.
Sadly, the one thing Apple has
never done right is mice.
Perhaps everyone at Apple goes to a fancy cafeteria for lunch and tosses their mouse in the trash when the ball gets stuck.
Where I work, people have to eat at their desks and might spend hundreds of hours mousing through massive spreadsheets. A mouse that gets gunked up in a week and cannot be cleaned is a big, big problem.