For use on Brother, Lexmark, Samsung Monochrome, and certain color developerrollers (see specific cartridge instructions). Quickly removes toner residuewhich can dramatically affect the print quality.APPLICATION DIRECTIONS:1. SHAKE WELL.2. Apply a few drops of developer roller cleaning solution to a lint-free cloth.3. Apply developer roller cleaning solution lightly along the axis of thedeveloper roller rub the roller back and forth.4. Rotate the lint-free cloth to a clean area until any residual toner disappears.