Cleaning the Canon camera mirror is a delicate process and should only be done with proper camera cleaning supplies. Carefully remove the lens, and use an air blower to remove any dust or debris, and then use a microfiber lens cloth with lens cleaning solution to wipe the mirror. Be extremely careful during the cleaning process, as all of the Canon camera parts are fragile. Alternatively, you can have your Canon camera equipment professionally serviced or repaired in our repair department at our stores.