what kind of washer fluid for a power washer?

springfield area, MO(Zone 5b)

I want to PW my vinyl siding. I think the washing fluid at Lowes is going to be expensive? It's $10 a gallon and dilutes to 16 gallons I think it said. So how much water does a PW use to work? I am thinking 16 gallons is going to go pretty fast, and doing a whole house, that will get pricey???

Is there anything I can mix up myself 1. cheaper 2. safe for my plants? and of course 3. safe to run through the PW?

suggestions please?

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