an apparatus for dispensing solid or semi - solid detergents includes a hollow elongated opening or chute and an arcuate plate that extends from the side wall of the apparatus to beneath the chute . this plate provides a planar support for a detergent bar placed within the chute . water is sprayed down the arcuate plate and projects against the detergent supported on the planar support causing it to dissolve and flow down a drain . the chute has a unique geometric design which is suitable to receive only one uniquely shaped elongated detergent bar . in a kitchen having several detergent dispensers , each detergent dispenser will have a uniquely defined chute so that only the appropriate detergent can be used in the appropriate dispenser .