jay- i use to use a nice dust cover i bought from Griot's Garage for my G during the winter, but lately i dont use it at all. it was so that i dont get salt dust on my G.
i use to open the garage door during the winter time while taking the trash out or pulling out my other FF fun car at the time, but with 2 RWD cars + snow, i just take the trash out from the porch these days and leave the garage door closed throughout the winter. lol