Tony, You put in my driveway 2 years ago on Tess Corners. Great work. I mistakenly left the sprinkler on over night and now there is a yellowish stain, I presume it is iron. Do you know of a good cleaning solution? I read that washing soda, a bit more caustic than baking soda, is a good solution that will not harm the concrete. Should I use washing soda, or would you recommend something else?
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