I've used S100 for about 10 years with no problems. I always start with a cool bike then rinse off the entire bike with a garden hose. I then spray the whole bike with S100 and water mixed at a 50/50 ratio. Allow to set for a minute or two then rinse off completely with a garden hose. Lastly towel dry.

 

+1, have had great results with the simple green.