i usually leave my boat in the Kip Marina for 3 weeks max at a time and powerwashing on its own doesn't clean the boat. there is staining that only comes off with some hull cleaner (i haven't found anything else that takes it off yet, on the to-do though, answers welcome!)
personally i'd try to take it out once a month for a day and clean it.
i had to deal with anti fouling for 15 years, don't miss it one bit.
cheers
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