I have a grey colored concrete driveway. The color was mixed in with the concrete prior to pouring it. I was doing some deck work near the driveway and I accidentally got an oxalic acid solution on the driveway. This left a stain where it ran down the driveway - it appears to have bleached the color partially out. I have tried orange peel, sodium hydroxide and xylene to get the stain out, but this hasn't helped. Any suggestions on how to get the color a uniform grey again?
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