Ralph S Cincinnati , OH July 01, 2016 Appliance: Maytag Dishwasher DWU9902AAB Maytag Dishwasher Dwu9902aab: Severe clogs in lower wash arm. How to replace Dishwasher Lower Spray Arm. Actually bought a new arm from your Co.. Before changing it out , I ran several dish machine cleaners, plus a 1/2 cup of white vinegar into each 'rinse' cycle. That did improve the wash results, but not good. I actually found many pieces of a paper towel, and some cellophane. 5 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes