Only down side with it is most of them contain a light degreaser which tends to strip all the wax etc off the car too. Fine if you intend to re-apply the whole polish wax etc every time but not so good for the quick wash.
As Autoglym state - you only need 2 cap-fulls of shampoo detergent per 10 litres of water. In other words, it's not suds that clean, it's elbow grease. This method seems to rely purely on vast amounts of suds rather than an effective method of removing the dirt. You can't beat a good old hand wash with a sponge and bucket !
the purpose of snow foam is to get rid of the majority of dirt, therefore you still need to wash it by hand afterwards, snow foam works by the little airbubles in the foam bursting causing the dirt to break up and fall off
really makes cleaning the car an easier task 
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