Why is my dishwasher not getting my dishes clean enough?

Several factors could cause poor cleaning: spray arm movement may be obstructed, spray arm nozzles could be clogged, you may be using incorrect amounts of detergent, filters could be clogged, dishes may be nested or loaded too close together, or the selected wash cycle may not suit the food soil conditions. Check and clean the spray arms and filters according to the care and maintenance section, and ensure proper loading with adequate water spray access to all items.

From the official Bosch Ascenta Dishwasher manual, page 16

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