Thank you for your input to help answer my question. I've decided to go ahead and keep the deflector.I agree, this thing isn't likely to come up in a car wash. It fits flat and smooth with the 3M tape all along its edges. Nothing really for the car wash brushes to snag on. I've had one like this on a 2014 Malibu for years and it's never had an issue in car washes.
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