An initial evaluation of a method to improve the cleaning of seed cotton, lint, and lint cleaner waste performed tests with cylinder cleaners operated with a range of grid bars and cylinder speeds. Results showed that more aggressive, square grid bars and cylinder speeds. Results showed that more aggressive, square grid bars performed better than conventional round grid bars in cleaning all three types of materials, but lost more fiber with the trash when cleaning seed cotton. An increase in cylinder speed from 480 rpm to 1,100 rpm also increased the cleaning performance of the cylinder cleaners. Of the five types of grid bars evaluated, conventional grid bars with 3/8 inch round bars and 3/8 inch gaps between the bars were optimal for seed cotton cleaning. The cylinder cleaner with sharp, square grid bars operated at 1,100 rpm cylinder speed cleaned lint better than the other treatments and was 80 percent as effective as a conventional saw type lint cleaner. 5 refs.