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You can try to sand the valance with 36 grit. It may gum up the sand paper. The other option would be paint stripper.
I used 3M Rocker Schutz on my valance. I also applied this to my side rocker panels and the lower portion of the rear steel bumper extensions.
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2011 Cayman Speed Yellow
1988 924S (Sold) 2000 Boxster S (Sold)
2006 Cayman S (Sold) 1990 964 C2 (Sold)
1978 911 SC (Sold)
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