My trackball and keyboard on my pearl 8120 are disgusting to put it lightly. I put lotion on my hands, then use my phone before all the lotion absorbs, there is makeup on the phone from when I talk on it, it's disgusting lol.
How can I clean my phone without doing damage to it?
In addition to what that trackball link explains, I would also suggest wiping the whole device down with a cloth or paper towel lightly damp with rubbing alcohol. Also, perhaps use a Q-tip with rubbing alcohol (just slightly wet so that it doesn't seep into the keys) and wipe in the space around the keys. Works for me! Good luck!!