cleaning ??,do it prop ,take it off the bike ,get a used 2ltr coke bottle (or any suitable container )-empty of course, put the chain in ,cover with a degreaser (gunk is really good )screw cap on and shake ,give it a while and when its not bad take it out and dry it with an old rag(bin this) and refit and relube ,while the chains off give things a gen clean in that area (chainstays and the cranks and stuff)not a lot of hassle and very good