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3M 8511 Particulate Respirator : should you wash these when they get dirty?

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I use these for sawdust, and sometimes blow them out, from the inside, with a small-orifice "air-gun" at about 100 psi, which works pretty well. Be mindful of what you are removing, however, and where it's going, and do ANY air blasting with care! I doubt they would respond to washing in any satisfactory manner. lester

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