Reply by PurpLev

Gary, someone posted the same question 2 days ago, and one of the responses was from a guy that contacted the mfg. and was told these bags are NOT TO BE WASHED! as this will loosen the material, and will reduce the filteration to 1000 micron…

just blow it with compressed air. and beat it outside.

-- ㊍ When in doubt - There is no doubt - Go the safer route.