Bought this to use with Karcher Rotary Brush (see my review of that, too). Had visions of, as other review, car covered in suds / foam and almost effortless car-washing from here on in - sadly this vision was far removed from any reality.
In 10 minutes use I went through more than 1/4 of pouch (properly diluted, as per pouch instructions). I had almost no foam / suds and car was basically as dirty afterwards as before. I was using cold water through pressure washer from outside tap - maybe you need to use hot water but, if so, nowhere is this mentioned on pouch instructions.
Resorted to bucket and sponge with alternative car shampoo.
My pressure washer (Karcher 2.15 110 bar, if memory serves)doesn't have a 'low pressure setting' as other review and, according to instructions, shouldn't use shampoo with pressure washer lance. However, I might just try this next time if other review results correct...