There is provided a washer assembly (100) for a camera (160) mounted on a vessel. The washer assembly (100) comprises a first part (110) connectable to a fluid supply, a second part (120) comprising a nozzle (150) configured to spray fluid towards an optical surface (170) of the camera (160), and a mounting part (130) couplable to a housing (162) of the camera. The first part (110) and the second part (120) are configured to be removably coupled via the mounting part (130) wherein, when coupled, the first part and the second part abut opposing faces of the mounting part (130) and a continuous duct (140) is formed between the first part (110) and the second part (120).