Originally Posted by
clarkbre
One method to clean really grimmy parts is using automotive brake cleaner.
This will clean almost anything, but for most bike parts it's overkill. Not only will it cost more than many other effective options, it's also among he most unhealthy choices out there. If you use it, be sure to have good ventilation, and arrange the direction of spray so that it doesn't bounce back into your face. When finished wash your hands immediately or better yet wear gloves when using it.
All in all, brake cleaner, or MEK is a poor choice (though effective) for home or garage use, except when nothing else works.