The dishes are not clean (poor wash). q The baskets are too full.
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The dishes have not been arranged properly. The spray arms do not rotate. The spray arms are clogged. The filters are clogged. The filters are not positioned correctly. Not enough detergent has been used or it is unsuitable. The detergent is old or has gone hard. The salt container tap has not been properly closed. The washing programme selected is too gentle.
The dishes are not quite dry q The dishes have been left too long inside the machine.
The door is difficult to close q The dishwasher is not levelled out or is not properly built-in.