You sure you need to fog? How long is your winter? My F-225 sits for up to 3 months and I do nothing except change oil/filter and oil in foot. You can use this opportunity to ..
spray powerhead, grease fittings, spray all exposed hyd steering
tilt motor down to drain
remove-re-grease prop shaft (there's a grease fitting behind prop)
3 years or so old, change water pump, more often if in silted/sandy water
change fuel filter (the big blue one) check fuel filter on motor
turn off batteries
I'm sure others can add more.