What Lee Willis said.
Where I live, NW suburbs of Chicago, you aren't supposed to put chemicals in the trash anymore, you have to wait for a 'collection day', put it in the trunk of your car, drive it to the pickup point, they open your trunk while you sit in your car with the hazmat outfits on and take them out.
I would think if the only ingredient is isopropyl alcohol, you can just use them up.
Actually I would NOT use some unknown chemical on Fastrack since it has a plastic base, I would be more willing to try it on steel (only) tubular, so for instance, no K-Line Shadow Rail. I have seen acetone shatter a piece of plexiglas, and brake fluid ruin an F3 shell.