Paint thinners are solvents that can dissolve paint and reduce viscosity of paint or “thin” it for use in sprayer applicators or when simply needing a thinner mixture to work with. Because they dissolve paint they aid in removal of paint on brushes, rollers and general cleanup of spills or splatters. Paint that has been left open will begin to harden and dry and become thicker. Thinner can counteract this. A number of other solvents can be used to remove paint. These include acetone, turpentine, naptha, xylene, methyl ethyl ketone (MEK), and denatured alcohol. Before using solvents, check product labels for appropriate use and for any safety considerations.