Its called Magifoam. buy it at Autobrite........you really need a pressure washer to make it happen.......
Preferably with a foam lance as an extra........then fill the bottle to the correct level spray the foam on the car let it do its job for 6-8 minutes then PW off.........job done
You can if you like use a wash mit if you think its not working.....but that defeats the object.