There is no economic justification for a further tightening of sorghum cleanliness standards, or for separating broken kernels and foreign material into two grade factors: broken kernels (BN) and foreign material (FM). The additional cost of cleaning all sorghum to a maximum 5 percent BN, 2 percent FM level would exceed the additional benefits by $0.8 million. The additional net cost of cleaning only export sorghum would be $0.5 million. The most promising option for increasing sorghum cleanliness is to establish a new grade determining factor by summing dockage and FM percentages, and using the resulting sum as a grade-determining factor.