Oh my goodness. We've had our boat for almost a year so this was our first winter. It's a bow rider with awesome seats... lots of them... for eleven to be exact. We put the snap on cover on the boat and then threw on one of those covers that goes over the boat and ties to the trailer. We opened it up this morning and wow! Mold and mildew everywhere. We've been scrubbing it all day (there are way to many seats in the damn boat) with soft scrub and it's as good as it's gonna get. Most of the junk came off but there are areas with black mildew that just won't come clean. We also tried some mold and mildew remover - no luck. Is this normal for a boat that is stored outside and what can I do next year... at this rate the seats will be trash in no time!