I never dry my carboys. I clean them with very hot water and Oxyclean for an overnight soak after each use. The following day I simply drain and rinse them well then seal the top with foil or plastic wrap. A Star San rinse before use and I'm off to the races. I've never understood why some feel it's necessary to dry the carboys.
I don't dry mine. If they are ever empty (which is rare) i fill them up with bleach water. Same with my mash cooler. I store all my hoses, air locks, etc. in bleach water soaking in my cooler all week. I had a mold problem once a few years ago in some of my tubing.