Grid bars having a chisel shape and sharp cutting edge were designed and installed in a modified cylinder cleaner. The modified cleaner's seed cotton and lint cleaning performances were evaluated in two tests. For seed cotton cleaning, results indicated that seed cotton cleaning efficiency of the modified cylinder cleaner equipped with the chisel-shape grid bars was 2.0 to 2.5 times higher than that of a cylinder cleaner equipped with narrowly spaced flat, square gird bars. The tests also showed that in comparing to a saw-type lint cleaner, the modified cylinder cleaner could potentially gain a maximum of 6.4 kg/bale of fiber without compromising color and other fiber properties. This modified cleaner was equipped with narrowly spaced chisel-shape grid bars connected in series with a saw-type lint cleaner with one cleaning point.