Kerosine and an old dish-washing brush worked well for me. A better idea is to invest in a scottoiler automatic chain lube-er. It uses an oil instead of a sticky wax which cleans itself once you've got it dialed in (and before that simply wipes off with a clean rag). It also means your chain is ALWAYS lubed (with no effort from you) which has GOT to extend your chain life. Think about it, a chain is a bunch of metal-on-metal pivots, and the new O or X ring chains like ours are a bunch of metal-on-rubber-on-metal pivots. Having them run dry at the speeds chains move at will wear them out real quick. Putting wax on a chain may lubricate it, but it will also provide a sticky surface to which dirt will stick, then get ground up in the links to form a grinding paste.

Matt