Yes.
Yes, quarters or credit card or load a loyalty card to earn free washes and use that. It's whatever works for you!
They are both. You can get a card and add money using cash or credit card. You can also use quarters in the machines. When you use the card after so many washes you get a free one so it is worth using.
You can use both
I think most machines you need a card. But don't quote me on that.
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