I normally fill up my foamer bottle with 3/4 water and some soap.
On my PW there is a black knob that allows for changing to foam to soapy water.
I like zaino for glossy paintwork. Just about any car shampoo you put in the PW foam bottle will make the shampoo foam.
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2013 BMW INDIVIDUAL ///M5 {Frozen Black/Amaro Brown/Amaro Brown Alcantara/White Contrast Stitching/Piano Black Trim}
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