Not really in Australia, our winters are some of the best times to go sailing, unless you are in Hobart that is!
Very different in the Northern hemisphere though where the water freezes and you have to take your boat out of the water, remove the rig and put anti freeze in anything that uses water.
That is where the Vacuwash process developed due to the sheer volume of sails that needed cleaning prior to winterising. Boat owners there know the benefits of a yearly sail clean and it is in their yearly boat maintenance schedule.
Over half of our business is from returning customers who also know the benefits of a yearly sail clean.
If you aren't going to use your boat over winter, then at a minimum get the sails off the rig and put them below, or better still send them to us for a wash. The same applies for your canvas.
This poor owner didn't get all his winterising finished off before disaster struck.
Everyone has an opinion, here are mine on sails and canvas, or whatever else I feel a need to rant about.