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I have a £30 pressure washer which produces max 100 bar. Got it from Argos over six years ago. I took a punt and bought a foam lance not knowing if it was good enough to produce a good foam. It literally coated the 197 in a thick (possibly too thick) foam in seconds. With the normal gun on it does a great job of removing all the crud and foam with ease. You don't need to spend a fortune to get a good foam result.