I don't know if anyone else said this yet but maybe try calling a small time fire extinguisher sales/service guy. theres one around here that would probably take all the chemicals out of them for you. or just buy the extinguisher. try doing research on how the companies like that take the chemicals out of them if your gonna do it your self. anything is better than sending them to the dump. you could even just throw like one or two of them in every fridge you get until there gone and let guys like me breath in all that crap when it comes down the picking line. thats what everyone else does.