Use baking soda to cut down on moisture and mildew.
.hagerty.com/articles-videos/articles/2011/11/01/step-by-step-guide-to-winterizing-your-car
Stop at an auto parts store and buy a fresh bottle of fuel stabilizer. Then fill the tank at the gas station and pour in the recommended amount of fuel stabilizer. Drive the car around for about 15 minutes to get the stabilizer mixed into the gas and spread throughout the fuel system.
There’s no way your battery will stay charged over the winter. And once it loses its charge, it can freeze. Then it’s toast. Either remove it and store it indoors, or keep it at full charge by hooking it up to a battery maintainer (shown is the SOLAR No. PL2110 Pro-Logix available through our affiliation with amazon.com).