Burn barrel.
Let's trot out the warning about spontaneous combustion and solvents, rags, thinners, grease, cosmoline. You stack this stuff together in a tight spot (garbage can) and it will burst into flame. If you don't have the option of a burn barrel, hang the rags out to ventilate, evaporate. Ventilated area. With the garage door closed, I find the garage interior smells like gun solvent after cleaning ONE rifle. These solvents are volatile!