Depending on the state of the filter, you can either clean it by running it under warm water or scrubbing it with a sponge ...

Add baking soda (or an oxygen boost product), dish soap, and salt (if you have hard water) to your dishwasher’s detergent ...

The Easiest Way to Make DIY Dishwasher Detergent When You Run Out (Better Than Store-Bought!) ...