How do you clean a hairbrush? I have a barrel type that lets the hot air through from hair dryer, v good and all that, but have just realised that masses of my moulted off hair is threaded right through it and I can't seem to get it all untangled. Can I put it in a large jar of something like that blue stuff at the hairdressers to get rid of the hair? It is really minging now I look at it.