Reuse paint thinner

After cleaning brushes, I pour the thinner in a gallon bottle that I mark "Old Paint Thinner". The paint solids go out of solution and solidify in one mass, leaving clear thinner that can be used again for cleaning. I would not use this for thinning paint though. It does take a while for the action to take place. When the mass of solidified paint solids gets close to filling the bottle, you can take it to a hazedous waste disposal facility.