Prefer washing with hot.
How to clean mould washing machine drawer. Add some dishwashing liquid and the vinegar and give it a swirl to make some bubbles. Leave it for one hour. Clean the drawer door seal and drum regularly.
Scrub the dispenser until all soap film and mold are gone. Clean them if clogged. Wipe the drawer every time you use the washing machine.
It is ridiculously easy to clean the inside of a washing machine drawer once you know how the best way to do this. Fill a bucket or mug with hot soapy water. Once the inside of the machine and drawer are both dry you can put the drawer back in the machine.
Run a bowl of hot water. Lisa Vincent suggested. Residual fabric softener and detergent can stick.
Turn off the machine remove the detergent drawer and check its holes. Then scrub the visible mold away. Add 2 cups of white vinegar directly into the wash drum.
Take out the drawer and wash it. Take some Bicarbonate of Soda White Vinegar a Sponge and some Bleach. Set it in your washing machines hottest setting.