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Tire dressing will definitely make the tires brown. You need to periodically clean off the old dressing with a pretty strong wheel and tire cleaner and a stiff bristle brush. I've found that high pH cleaners are effective at this, though it may require multiple cleanings. Hit it with the cleaner, scrub, and rinse, until the foaming from the cleaner is white. When the cleaner is no longer turning brown, there's nothing left to remove.
Using a narrow nozzle (15ยบ) from the pressure washer at close range can help speed this along, but tread carefully around the lips of the wheels.
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