Mineral spirits are a type of solvent commonly used in painting and cleaning. They are derived from petroleum and are effective for thinning oil-based paints, varnishes, and stains. Their ability to dissolve oils makes them useful for cleaning brushes and tools after painting. In addition to their use in art and home improvement, mineral spirits can also help remove grease and grime from surfaces. They evaporate quickly, leaving little residue, which makes them a popular choice for various cleaning tasks. However, proper ventilation is important when using them, as their fumes can be harmful.