What do you use to winterize?

Ethanol free fuel, some fuel stabilizer, good wash and cover, I've been using Bounce sheets for years, both in cars parked indoors and out, never had any rodent issues. I put one under each mat, and 2 or 3 in the trunk. Known some people that put oil in the cylinders nut never felt the need, just makes it harder to get it back up and running in the spring. Have put jackstands under on some occasions, but no longer use them. Have also used tire skates to make it easier to maneuver into the corner of the garage, keep the tires off the concrete, whether that helped or not I couldn't say.