How to clean your dishwasher
You should use a machine cleaner every 6 weeks to 3 months in order to clean your dishwasher. The Bosch dishwasher-tested machine cleaner comes highly recommended for dishwashers.
When cleaning your dishwasher, you should clean the seals and door area with a damp cloth, soaked in soapy water where necessary.
The filter should be cleaned after each wash.
You should also check that the spray arms are clean. Watch how to do so in this video.