Step 1: Ensure that the steamer has been turned off an unplugged, then wait for the appliance to cool down.
Step 1: Wash the basket in a mixture of water and washing-up liquid, plus a drop or two of white vinegar to remove any odours after cooking fish. To remove limescale and other marks, rub with a piece of kitchen paper and a few drops of cooking oil.
Step 2: Heat the water with a lemon cut in half in order to remove any limescale deposits in the centre.