Uh, the general public doesn't. That said anything following is just jokes and jest and entertainment and don't read my alien codes to planet Zed! Easiest way is to take the can in the middle of a field, turn the valve, walk a away for a while and hope it's empty. Fastest way is to put a full pull pressure torch head on the valve, light it, open it as far as it will go keeping a flame, and waiting for it to burn out. . Then waiting a while longer. Instant method is shooting it with large calibre incendiary rounds shunted with tracers. Any you could always toss it in your camp fire and wait for the pretty boom.
Still reading? Naughty user! I toss the "how do I remove the brass fittings from propane tanks" question in the same category as "how do I remove gold contacts from a lithium battery". If you don't mind missing limbs, melted skin, and death, watch YouTube. Plenty of stupid idiots will show you how. Note 38 states require scrap liquid/compressed gas containers be halved. 4 more require them quartered. And two ban consumer scrapping of them entirely. That includes propane, butanol, and fire extinguishers. So if they will buy them from you the law in 42 states says you have to cut it on half first. At the least YouTube is full of people whacking them with sledgehammers. All fun and games till somebody blows up. Those videos don't get posted (for long) so you've be warned.
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