How do I clean the drain pump on the WKD24361EE?

First, remove the drain hose from its retainer, remove the plug, and release the washing water into a container, emptying it several times as needed. Once no more water runs out, unscrew the pump cover, clean the pump housing, remove any foreign objects, and ensure the impeller can turn freely before replacing and firmly screwing the pump cover back. (Page 20)