W.A. Rice Seed Co. manufactures a seed cleaning machine that separates seed based on texture of the seed coat.

Each pair of rollers in the Dodder Mill is covered with a special cloth which has a nap. As the rollers revolve, the rough coated weed seed is picked up by the nap of the cloth and separated from the smooth good seed based on texture.

The Dodder Mill is used primarily to clean alfalfa and clover seeds.