I am going to try this tomorrow.@sha007 Yes, you can wash the ear pads.. I've done so with my HD700 and just last night with my Senn HD800. Same type of black dust will discharge a bit, but the pads are back to being plush, clean and haven't deteriorated.
Just sent the same information to some friends:
"Soak the pads and headband in a bit of warm water mixed with 4-5 drops of Blue Dawn soap. Let soak for 1-2 hours. Lightly squeeze with paper towels and set to dry in a warm area (not in direct sun light)."
Does the headband pull out like the ear pads? I gently pulled but don’t want to risk ruining it in case there is a clip or adhesive holding it on. It looks very snug in there