Taking out and cleaning the mirrors

grab the the odd shaped tool (in tool box next to little laser)

acetone

Q-tips

microfiber towel/blue paper towels

unscrew the back plate holding in the mirror being careful not to drop it once its open

NOTE: taking the mirrors out shouldn't mess with the alignment if you are carful enough, but should check it after wards just in case.

start with using a q-tip and acetone to softly clean the surface until nothing is on the q-tip

use the microfiber towel to get off any remaining dust or debris

reinsert the mirror into its slot and slowly tighten it