Use a torx t6 screwdriver to get inside. Press a along the top of the phone with a blade to release the tabs then open it like a clam shell. I've taken a few hundred apart and just pulling it open has never damaged the case. Then I would rinse it in 90+ percent rubbing alcohol.
Prior: BES: 7510, 7520, 7290, 7230, 7130, 8220 (No Data Plan), Droid Eris
Post your question on the forum, don't PM me.