My two dive buddies went to Bonaire last year. They are both chummers, one generally when underwater, the other on the surface, but when they catch a glimpse of the other, they will both blow. Ah, togetherness. First dive of that trip, surface chummer loads his regulator, jambs it up. He really did try to wash it out, but the tech found more debris when he went through it. Didn't seem to bother the tech much, he rinsed it out then put it in his mouth to test it. Both chummers almost lost it watching that happen.