Some of the things I do. Grease all the fittings to push the water out of the suspension and spindle shafts. Sea foam and run it for a while to get the gas through the carbs ( watch engine temp, don't let it overheat.) Pull air box run engine to fog it. Take drive belt off. Clean the whole sled up. I jack it up and put a milk crate under the front of the belly pan to get the ski's off the ground. Jack up the back and put a jack stand under the rear bumper. Stuff Bounce drier sheets everywhere to keep the mice out. There are a lot of other things you can do that I know I'm missing. Google it for more info. Here is a complete check list I would give students when I was a snowmobile safety instructor. Hope you can see it.