Originally Posted by coolhandjjl

I've been soaking old parts like old bbs, headsets, etc., in mineral spirits for cleaning to be used on a bike build I'm working on. I have two small cups, about 1/4 cup each I have been soaking these items in. I'll also have to clean whatever derailluers I end up with as well. What do people do with the used-up, gunked-up mineral spirits? Do I pour it on some old wood and let it evaporatae outside? Or is that a no-no and I need to take it to my county's disposable drop off they have in the summer months here?