We have had a problem with grit getting all over the dishes. At one point we had found some information about blowing out the rinse arm. It seemed to help temporarily but now.... It's like someone has thrown a cup of sand in there and it's blowing all over the dishes in the top rack.
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Re: Grit in dishwasher
Sounds like you have a low water fill problem or maybe a water
temperature problem. The water should be at least 120 to 130 degrees
Fahrenheit to start with. Gel soaps can cause a lot of problems with
scum and leaving a white residue, mostly when there is not enough water
in the dishwasher. After it fills there should be water almost up to
the heating element. Also look for the water draining by itself.
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Is your state one the banned phosphates? If so, try adding a tablespoon of TSP to the detergent. If not, is there galvanized steel in your water supply? The grit in most washing aids removal of food on the dishes but is supposed to be gone by the rinse.
I have the same problem. We cleaned the dishwasher out because the grit was coming from the dishwasher...however, we still have dirt/grit in our dishes, but a lot less. How do we get rid of this all together?
Very common problem is soap build up in these machines. Try putting it into a wash cycle with no dishes, and no soap. Let it wash for about 5 minutes, and then open the door. If you see alot of soap suds, then soap build up is the problem. Try doing a couple loads with no soap, and no dishes, and throw a cup of vinegar into the machine halfway through the wash. Repeat as necessary. This should solve your problem.
Can you remove the upper spray arm (is yours under the upper rack?)-mine unscrews and then you have to wiggle it off. Run faucet water into the arm; sometimes little bits of crud get stuck in the holes that spray the water out, and this prevents a complete rinse. I just had to clear these holes myself due to same problem (I might have a different machine, though). You can do the same for the lower arm.
My model is simillar Cheri's. Every couple years I have to remove the plastic spray bars. They are held on by a simple torque screw. Once removed you will see debris plugging many of the holes. I have found this on all 4 of my spray bars. This debris prevents the right amount of water in the wash and rinse cycles. The upper spray bars seem to be the worse. This explains the trouble most folks have with glasses in the upper rack. Also check the docking station. You will fiind it along the back wall of your unit. The plastic tubes on the backside of each rack will slide into a hole in the docking station. After a few years the rubber seal in the docking station will be worn away. Once this happens, it prevents the correct water pressure to the upper rack. The replacement part snaps into place and cost about $25.