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The standard foam lance (FJ6) you get with Karchers isn't great as other have said. The FJ10 is much better or get the Autobrite snowfoam lance which is far superior but so is the price.
Your mix is very weak too at around 5% you need to up it to around 20-30%.
The density of the snowfoam varies between brands. The Autobrite snowfoam is more watery and I don't find it that effective at removing dirt regardless how warm the water is. I prefer Autofiness Snowfoam in combination with the Autobrite lance makes shaving foam thick snowfoam that clings to the car and removes much more dirt whilst using very little of the mix.
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