No. The all-weather IP66 rating of the fixture ensures that the inner parts in the lamphead are completely free from dust, dirt, or water ingress. However, you may want to clean the external housing and heat sink of the fixture with a hose, just to make it look better to the eye.
SkyPanel X is an IP66-rated fixture, and therefore is protected against powerful water jets (100 liters per minute at 3 m distance with a 12.5 mm nozzle from all directions). This must be clear cold water to avoid...