I'll add my two cents worth... Some of the answers are good, some so-so. as a hint, look up other posts by me, and find one that says, "I get the dumbass award". Read it VERY carefully, then don't do what I did! Do this instead... Turn it upside down and shake to mix it like you were going to spray. Then hold the spray button until the gas stops. Shake some more, and spray again until the gas is gone. Repeat four or five (or ten) times, until you are certain, down in the very pit of your soul, that nothing bad is going to happen when you drill, punch, poke, jab or otherwise compromise the integrity of the hull. The first couple times gets the main gas layer out. Subsequent shaking and spraying will help get more gas out of liquid suspension. Then you should be able to use a can opener and dump it into your favorie container. FWIW, I shake rattle cans upside down to let gravity help get the sludge off the can bottom.