To clean the detachable nozzle, press the nozzle release button to remove the detachable nozzle from the appliance. The nozzle can be cleaned in warm water with some washing-up liquid. Make sure the nozzle is dry before you reattach it to the appliance. Also check the other accessories that come with the vacuum cleaner and make sure they are not clogged.
There are two ways to clean the roller brush. You can use a pair of scissors to cut the hairs etc. that have collected around the roller brush. For easier cleaning, you can take out the roller brush completely. If you want to clean the roller brush with water, you can do so but only after you have removed the roller brush from the floor nozzle!