I actually used this little foam gun type set-up that I got from target for like 18.00 or something? It has a little plastic container you put the soap in and you just coat the car and let it sit...or you can go ahead and wash it right after if you don't have any set in dirt that needs to be loosened up.
The soap doesn't last very long, but it's better than the high prices of some of the foam guns out there.
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