In an assembly of an instrument panel and an anti-fouling system, the instrument panel is designed for arrangement on a subsea structure that includes at least one instrument which is to be inspected and/or manipulated underwater, by a remotely operated underwater vehicle. The anti-fouling system includes at least one anti-fouling appliance for performing an anti-fouling action on at least a portion of the exterior surface of the instrument panel. The anti-fouling appliance may have at least one of various possible arrangements with respect to the instrument panel, including an exterior arrangement and an interior arrangement, and an arrangement on the exterior surface of the instrument panel. The anti-fouling appliance includes an ultraviolet light source. A light guide may be provided to guide light from the light source to desired destinations.