Acetone:
Check the laws and environmental impacts in your area.
I live in Ontario and, like paint, acetone cannot legally be disposed of in the home. You can do it, I suppose, but it's bad for the environment.
I didn't know this until after I bought some, and now I refuse to use it, so I'm stuck.
Just get another can to dump the waste into.
Here in CA you can take that to the waste disposal facility