Sure you can. Just remember that when you put the tokens in to get started, it runs on a timer. So you may want to put the minimum amount in just to get your car wet. Then hand wash it. Then put more in to rinse off your car.
As the other posters mention, yes, but please use our water and soap. The soap in particular is designed to be biodegradable and environmentally safe; the same isn't true for other products on the market. Also, please be mindful of other customers. If you see people waiting, don't go too long in bay. That's liable to just annoy the next guy.
Assuming you will use their water yes because I used my own stuff I bought for my car
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