The Daily Mail (United Kingdom) featured a story on dishwashers being a breeding ground for potentially harmful fungi, including Exophiala, Rhodotorula and Candida parapsilosis. This is based on new research, which was published in the journal, Medical Mycology.
According to the article, it is recommended that consumers remove the racks from their dishwashers and wash them with hot water before wiping down the inside and allowing to dry. The article suggests mixing half a cup of vinegar with two cups of warm water and using this mixture to scrub the inside of the dishwasher, particularly the door seal. It is also recommended running the dishwasher on a hot setting with a small glass bowl of vinegar on the top rack before running it again with a cup of baking soda poured on the floor of the machine. However, before using again, clean the dishwasher with the normal detergent used.