I would not know how to clean it. I would use soap and water, over and over. Let it sit out in the open to air out. Glass bottles don't absorb any of the smell so it's up to you to clean it really well.
I would dump it outside in the grass or somewhere in the wild. It can't be terrible for it. It is an oil, so I would think it is ok. Maybe even a dumpster!? Those are my ideas. Good luck with that.