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I have a brick row house, which has an exterior walk down cellar. Last Spring I had the sidewalls redone due to cracks in the cement. The worker chilled the lose cement off the bricks and replaced it with new cement giving it a brownstone effect. These past several months I’ve noticed that a section of the cement has what it appears to look like patchy white stains. I quickly hosed it, yet it reappeared. Would you think that this is mold?