Rags contaminated with solvents or some wood preservatives and stains should be handled very carefully because they may spontaneously start on fire if the rags are not stored properly. Not all solvents and wood preservatives pose this danger, but it is better to be over-cautious.
Conduct all activities outdoors.
Wear protective clothing such as chemical resistant gloves, eye protection and long sleeves.
Hang rags contaminated with solvent or wood preservatives and stain outside or spread them out to dry on a nonflammable surface outside away from your house and other outbuildings. The area must be away from potential ignition sources, children and pets.
When completely dry, the rags can be put in a trash bag and placed in the trash. Store the trash bag outside until trash pickup day.
These procedures are intended for rags contaminated by household use of solvents or wood preservatives and stains only.