Hose it down after every trip or first opportunity to have shore water, use a chamois mop on the fiberglass, microfiber cloth on the stainless. We probably washed it with a mild soap a couple three times a year, especially once we were docked in a home marina rather than cruising, though the flying bridge deck needed it more frequently. We used Rejex on everything, every few years, so this made wash down a snap, all that was needed was fresh water even after being at anchor or on a mooring for weeks.