I have one and it works wonderfully. Obviously not as good (not even close as a matter of fact) as using like MTM hydro ($50) with pressure washer (at least $200 for decent ones) but if that's too much, this is a great alternative.
Chemical Guys shampoos are too expensive for me so I just bought a gallon (128 oz) of "Turtle Wax Wash and Wax" for $5.5 at Walmart.
If you end up buying one, make sure to adjust water pressure and ratio so you're not wasting too much.
I'd just set ratio at C or D (3rd and 4th highest) and adjust the water pressure.. how much soap use depend way more on water pressure than the actual ratio.
Hope this helps!
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