Dishwasher will finish cycle but sometimes will not completely drain all water, leaving dirty water in bottom.

Clint, August 2009

Have you touched the "drain" button once to let the drain run completely by itself?
Did it drain fully when you did this?

My guess is that the "float" isn't working right that indicates when all the water is drained out.

http://www.partselect.com/ModelFrames.aspx?ModelID=272823&ModelNum=MDB9100AWW&mfgModelNum=&ManufactureID=1&Selected=35998&Position=5&mfg=Maytag&Type=&Mark=3

JohnN, October 2009