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Hadn't heard of that Steve, but it does sound like a stupid idea. I can see the theory behind using a detergent on bad areas after all racing has finished so that it has a day or two to break down the oil (but wouldn't the surface then require rinsing to get rid of what remains of the detergent).
I thought that all entrance tickets for races stated that motorsport was dangerous and that you watched it at your own risk. I would have thought that covered a lot of things, including a little bit of airbourne dust.
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