As was said before, rinse the bottles ASAP after using them, and then soak them overnight in OxyClean. I haven't had to use my bottle brush in a couple of years since I started that routine.
Be careful what you wish for, friend, 'cause I've been to Hell, and now I'm back again- Steve Earle
Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.-
"Heroism on command, senseless violence, and all the loathsome nonsense that goes by the name of patriotism -- how passionately I hate them!"- Einstein, again