What is the most logical next event?

How to dispose of aerosol cans
Ensure that the can is empty.
Before you toss your aerosol can, take a moment to make sure that it is really empty. If no product comes out of the nozzle and it does not appear to be clogged, the can is empty enough to dispose of safely.

Pick your answer from:
1). If you're not sure if the can is empty, try shaking it. You shouldn't feel any liquid moving inside.;
2). Check any cracks, grooves, or dark areas that might make it harder to shake the can. Wear a respirator when handling aerosol cans.;
3). Double check that the can is empty before you throw it away. Do not throw out soda cans of any kind (cola, beer, as long as the can still contains its contents), because doing so could cause serious chemical damage to the can's interior and the contents.;
4). It's better to dump all your aerosol cans then to throw all of them away if you want to avoid the hassle of buying new ones. Air filters or gaskets can get clogged if they are not thoroughly vacuumed or washed.;
1).