Spit

It's kind of nasty, but it is also very useful for cleaning bikes. I guess that might explain spit shine.  Seriously when cleaning a bike that has that nasty accumualtion of sticky whatever drink all built up and baked on from months of sun exposure nothing I have come across cleans it better than spit.  Windex won't clean it, Acetone won't clean it, the bike manufacturers degreasers wont' clean it, but spit takes the stuff off easily.  There has to be a product out that works as amazingly as spit.