Here is how to operate the car wash.
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Open the gate, let 1 vehicle in.
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Click the Center button, it should be green. Control it to give the driver signals (red=stop, green=go)
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Make sure the button is on stop once the vehicle is aligned.
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Make sure the car does not move, and start the conveyor.
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Once the car passes the first rinse, you can close the conveyor and allow the next person to come in (restart the process)