Geng,I must add sumthing lar....whatever you do,after having the lights apart,do not put too much pressure whilst cleaning the reflector as this will cause irreversible damage.When I did mine,i used facial tissue and wiped it 'normally' only to find that i have wiped OFF the reflective coating.Lucky me I have another set on standby,courtesy of a fren who replaced his lights due to bad pitting of the lens.You know the soft brush u use to clean the camera lens.....that's the one to use for the reflector.......