The top section wont wash clean - Maytag 24 in. MDB5651A Built-in Dishwasher

You may have debris in the sprayer arm jets. It is usually simple to remove the sprayer arms. Then rinse them well using the sink sprayer for forceful water power. I have sometimes had to use a tweezer to remove bits of plastic, paper, bone, or food particles. Once you've remove the debris, rinse well forcing water through to dislodge any other debris. Once you've reattached the sprayer arms, you should have cleaner dishes. Also, some brands of dishwashers have a pipe that runs up the inside back wall and connects to a pipe that runs under the top shelf. Water flowing through this pipe under the top shelf propels the sprayer arms. If the connection at the back is not flush with the "propel" pipe there won't be enough water pressure to turn the sprayer arm. Check to see if your dishwasher has this type of set up.
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Good luck!