A LBS did a show and tell for our club last summer where he washed a members bike. He used a commercial can of some bike cleaner product. As I recall it was some environmentally friendly foamy stuff out of an aerosol can. He used one of those chain cleaner contraptions too. The bike he washed wasn't particularly dirty or grungy IMO. He didn't seem to concerned with getting the chain cleaner contraption all that clean after he used it, but then I'm sure the shop uses it daily. One thing I remember him saying is that washing a bike was the first thing they do when they get a bike in the shop to work on, no one likes working on a filthy dirty bike. And he advised to use one rag to clean the really greasy bits and another to wash the frame etc. - throw away the greasy rag when your done. Then at the next wash use the rag you used to wash the frame to wash the greasy bits and get a fresh rag to wash the frame. He also suggested washing your bike weekly.