you are not supposed to clean throttle body butterflies, specially with any kind of scrubber or wire brush. you dont have to clean it so it looks brand new, it will not make any difference in performance. if you must clean it for peace of mind, put the throttle body back on, and get the seafoam in the spray can, it has a special hose that slips in between the throttle body bore and the air intake tube, start the car and spray, it will clean it enough to make you happy and wont damage anything.