The other stuff you may want to do is run the ski on the trailer with a hose flush kit. It gives me a chance to inspect water hoses and fittings for leaks while it is running and also removes sediment from the system. But never have water running thru the engine with out the engine on. If you do it will hydrolock the engine and flood the crankcase. You can also cut some pvc tubing into rings to set on the seat clip posts to keep the seat up while storing for ventilation. Oh yea last thing cover it up. I have also found that keeping the hull waxed good is helpful in the prevention of scum lines.