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I see.
Bringing your own stuff ensures you're using quality clean materials for starters. Second - the pressure at the place isn't adjustable so there's no way to fill a bucket there. This is why your best bet is to fill everything at home with nice hot water (bath tub or laundry room), seal it up, and take it with you.
Additionally, you'd have to pay for the water at the car wash bay with quarters rather than having the perfect amount brought from home.
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