I know this isn't a new idea, but I never realised how well it works til tonight. I was just sat at a mate's house smoking and watching him play some Xbox game, and I started playing with my dreads 'cos I was bored. I was just grabbing the root and rubbing it on my head in a circular motion.
I only did it for like three minutes on each dread, but they all knotted up so much in that time.. I'm making a point of doing it to all of them now.