Even with the best will in the world all dishwashers get a little grimy after being used for a while so it makes sense to give yours a little spruce up periodically to ensure it keeps working optimally.
Here’s what you need to do…
Firstly fill the sink and add purpose made dishwasher cleaner, some people use vinegar but this will corrode the rubber seals over time. Remove all the removable parts of the dishwasher and place in the sink to soak. Remove the trays and cutlery rack and wipe down the trays with a soaked cloth. Check for any dried on food particles and remove with a knife or other sharp object. Clean the rotating arms so that the water can flow through them properly – you could use a toothpick or a fine piece of wire for this purpose.
Wash inside the machine and around the door with a toothbrush to get into the crevices, the bottom of the door and around the seal. Wipe the insides with your soaked cloth. If you have a problem with mildew and mould try leaving the door ajar after use to dry it out. Bleach as a cleaning agent is not recommended.
Iron and rust can sometimes be a problem. Some machines have iron filters. Sometimes salt will wash the iron away but it is best to consult a repair man in case the pipes are rusty. If the baskets are rusting you could paint them with sealant or replace them, sometimes new racks and new parts for the machine are not too difficult to replace. Give this site a try if you need spares.
Finally check the bottom of your dishwasher at the wastage drain and check for any debris stuck there. It is also possible to take apart the bottom of your dishwasher to clean underneath. First make sure the dishwasher is unplugged and double check. Then unscrew the filter being careful not to lose the screws. Take pictures as you dismantle the filter so you are sure where they go when you come to put them back. Tape over the aperture so that debris does not fly down it and clean the drain, you may need detergent cleaner for this purpose. Put the machine and racks back together and run a cycle with the machine empty. Hey presto, one clean dishwasher.
For another helpful run through of the steps check the video below from AO.com.