The idea behind applying snow foam to your car before hand washing it is simple and the benefit is obvious. If you apply a blanket of detergent-rich foam to dirty surfaces and leave it to dwell for a while, it will progressively dissolve and suspend a lot of dirt and grime. When you then rinse it off, much of the dirt and grime is washed away with it, leaving relatively clean surfaces behind. Clearly, the benefit is that the bulk of dirt removal is done before you actually touch your car with a wash mitt, which greatly reduces the risk of inflicting marring and fine scratches during the subsequent hand-washing step. However, does the foam need to be thick to work properly? Many people think so, most likely because thick clinging foam is visually impressive. However, the reality is that thinner foams often work just as well. Bilt Hamber auto-foam is one such example. It's thinner than many of its rivals, but it cleans every bit as well, and its effective strength can be adjusted by varying its dilution rate. It's different, but in a good way. Recommended!