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I've used it in the winter. I have a low powered electric one that I hook up to the hot water and it cuts dirt and grease amazingly fast. I just cleaned my larger mower and it cut the dirt/grease stuck to it came off like nothing. As long as you are using a low powered setting, its fine for a car. But why bother? You are still going to need to physically clean the car with a sponge or cloth. It would work well for wheel wells and areas you can actually get to. The power washer is not going to remove the film. Ever go to a self wash with a spray and then see the car after its drys? Not so great. If you can put your hand in front of the spray is a good rule of thumb as to it causing damage.
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