Under Carriage?

[daveift]

I am trying to find a product to clean the undercarriage of my Mustang. I have a 1 gallon garden sprayer that I have used to do the wheel wells with and that worked great. I am looking for some sort of foaming type cleaner that I can spray up under the car, let it set for 5-10 minutes and then hose off. I have a under car spayer/flush adapter for my hose that I made and it works great to get the NY snow and salt from underneath but I can not find a foaming type cleaner for the non-snow season. Any ideas would be great.
Thanks,
Dave