I am not sure if this will work but it seams like the same concept. I work with fiberglass insulation and when I take a shower I make it a cool one. If you take a normal hot shower your pores open up and let the fiberglass get in. If you take a cool shower then your pores stay closed more and you can wash the impurities away. It sounds like the same idea with the metal dust. Also long sleves should help.