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If the washer is getting the dishes wet all over, the the spray arms are working. If not, then the spray arms are plugged up and need cleaning.
The most likely cause is the water pump going bad and not creating enough water preasure to clean the dishes.
If thw washer is at least 5 years old i would think about replacement. The pump replacement will run you at least $250.00.
I would just put that money towards a new washer. At the end of the repair, you still have an older washer that will break down again sooner rather than later.
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$250 is the starting price with labor and materials. It is the base price. The cost could be higher depending on the actual cost of the parts and if it needs anything else.