Joe W Concord , CA May 15, 2015 Appliance: General Electric Dishwasher CDW9380N20SS Ge Dishwasher Cdw9380n20ss: Low water level led to soap crust on spinners. How to replace Spray Arm Water Supply Tube. Inlet valve failure not allowing tub to fill over time left soap buildup in main conduit and spinners. Soap was too hard to remove so replacement parts solved the problem Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes