Originally posted by Hebiki
or you can buy the integy bearing cleaner for $20.. and not remove any seals. throw all your bearings in there..and let it sit until your rechargable batteries dies.. or until the motor spray evaporates.. repeat until there's no grease left. 
Originally posted by JimMcClure
I just got a set of Acer ceramics for my touring car and the instructions say not to remove the sheild but just use the bearig blaster with motor spray to clean them then add one drop of their sin lube. They have the rubber seal of some sort. How does the dirt come out without removing the sheilds? Or does the dirt not get in because the shield is never removed? They are buttery smooth though.
Like Chris just said, use a integy bearing cleaner (or any sonic cleaner used for jewelry). Pop the bearings inside the bowl, fill it with motor spray (or cleaner of choice), turn it on and let it go for about 30 minutes.
The vibrating action works the dirt & grit out of the bearings. Gentley dry them off, add a drop of bearing lube, and you're finished (well, you still have to reinstall then back onto your car/truck/buggy).
TC
CoBroRa