Hi,
I usually stick them on a post and play a hose on one side of the roller so they spin themselves clean.
If using again soon then wrapping the roller tightly in foil with a little white spirit or water, (depending on the paint!) keeps them fresh for a while.
BTW when it comes to getting a decent finish quickly, cheap crap brushes suck IMHO. The breakeven point for buying decent brushes and cleaning them can't be more than 20 minutes of painting.
cheers, Pete.