I would say it depends on the quality of wash you want, if you have a water bill or not and the frequency you wash.
I am on a well (rural). So I have no water bill other than the electric for the pump and my pressure washer.
For me it's an inconvenience to drive 11 miles into town to use a coin wash. On average I'd say I spent $12 to wash it.
I bought a Ryobi plug in washer and a walmart foam cannon (that I put a smaller orifice into, works much better). Cost me a total of $120'ish. Call it 15 washes and it's paid for itself.
But through Winter I'll still have to use a coin wash. I'm not about to make a giant ice lake in the yard.
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