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Finally picked up a cheap Amazon pressure washer, foam cannon and 1.1mm orifice.
Did 2 washes....pics are after foam sat on car for some mins right before I rinsed.
(Chemical Guys Honerydew Melon)
Another day I tried the cheaper Armor All Wash and Wax.
Didn't foam as much as the Chemical Guys BUT the car came out slightly shinier if that makes sense.
I used 200ml of soap in the foam cannon. Next time I'll double it and see how it turns out.