I strip my gun completely after the season and give it a good cleaning. Lightly oil everything and store it. Then, like Tbone said, I will shoot the gun several times during the off season and lightly wipe it after shooting. Depending on how much I shoot it during the off season I may partially break it down and wipe it clean and reclean the barrel but I always try to have the barrel clean and dry by deer season.
I never have cleaned my gun the night before opening day though.