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- Feb 2, 2007
skep - I think the gel has peroxide in it but not bleach. I don't think peroxide will affect the dye in the stitching. I'm not 100% sure, though. youcould try the sandpaper trick too, but it's a pain in the rear on the textured midsole of the af1. however, I have gotten results with sandpaper, so itmight be worth a shot.