A device is coupled to a heat exchanger for mitigating fouling by applying a mechanical force to a fixed heat exchanger to excite a vibration in the heat exchange surface and produce shear waves in the fluid adjacent the heat exchange surface while the heat exchanger is in operation. In the method, resource units are initially distributed among the clients by assigning to each of the clients a nominal share of the allocatable resource. An insert for the dish basket adapted to be loaded with at least one of a plurality of silverware pieces and small dishes or other objects includes structure for providing autonomous run-off of dish washing liquid in contact with liquid problem retention areas of the insert.