My dishwasher does not seem to wash properly. When the cycle has completed some things are clean and others are not. I have cleaned the rotating arms and checked they are not blocked but nothing helps.
Assuming you've cleaned out the water filters at the bottom and the water heater is working (is the water hot when it's in the wash cycle?) then you may be suffering a problem of having a low grade tablet working with a low temperature setting. It happened to me with the cheap Lidl tablet and the Eco setting.
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Try fixfault.com to fix dishwashers.