I always just threw mine in the washing machine like normal laundry. I'm guessing you mean the small backpack we had issued starting 20 years back? If it's a one time wash, you shouldn't lose anything. Strip it into it's parts first, when it's done straighten it out and lay it out to dry. NBC isn't particularly old kit, it was just in it's infancy when I was using it so it ain't '42 OD3 equipment. Keep it simple.
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