Okay, so these things are made to be discharged valve up. That means there is a tube down to the bottom as the dry chem is pushed out. It may very well be that if you turn them over and rapped them, the dust will settle in the top of the extinguisher. At that point, you may be able to discharge the pressure without blowing dust all over. Once the pressure is gone, you can take the top off and dump the chemicals in the trash.
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