If you do not have a watertight container, spread the rags out on a non-flammable surface in a ventilated area. Weigh them down with no bunching or overlap. Supervise them until they are dry. Seal in a fireproof container.
Always wear heavy rubber or nitrile gloves when handling paint thinner. [3] X Research source
If there is more than 1 cup (240 mL) of material left, use the method below instead. Bring it straight to a hazardous waste facility instead if the solvent contains a halogenated chemical (anything with “fluor-,” “chlor-,” “brom-,” or “iod-” in the name). [5] X Research source These chemicals are not commonly used in paint thinners, but can be found in related solvents such as paint strippers and degreasers.
Many waste collection services will accept this, but there’s a chance yours requires you to bring this to a hazardous waste site. You can call yours to confirm. [6] X Research source
If there is still liquid inside, or a large amount of dried residue, take the container to a hazardous waste collection site.
Most hazardous waste facilities will accept pain thinner in a sealed metal or glass container. Contact your local facility if you have a large amount of waste to dispose of.
