Upon looking at my M-2600 after cleaning it with isopropyl alchohol it looked nice but, looking at it in certain angles I see the darkness of as5, cleaned off but left a dark color when looked at from cerain angles. Im sure everyone knows what I mean cause this has happend to all 4 of my bartons one way or another no matter how clean I try to keep them(AS always manages to find its way just the littlest ammount off the core). Does anyone know how to rid of this darkness?