I leave all mine outside. It was made to be outside. I cut wet grass. I mow in the rain. If your storage building is not climate controlled then why bother. And the worse thing people do is hose it off then put it away. Second would be the fools that cover it with a tarp. Now I have a few antique mowers that stay inside but they are not used. I do keep my mowers very clean and blow them off after every yard. I learned years ago to let a layer of grass get hard under the deck. Keeps water from getting on the deck and no more grass clumping up in the deck.i know of 5 guys on here do the same thing and have years of rust free decks.