texas, i use the grunge brush and kerosene to clean my chain all the time. mainly what i do is when the chain is in need of lube and/or adjustment, i take a small rag soaked with kerosene and run it over the chain to soften up any grime, then i take the grunge bush soaked in kerosene and scrub the chain. then take a dry rag and wipe the chain off, go for a quick ride to get the chain warmed up and then hit it with the lube (teflon chain lube is my personal favorite by far). every 2-3k miles, i'll take the rear tire off and soak the chain in a bin with kerosene. this is where the toothbrush comes in handy.