Hue Redish
If it’s a reddish color, it’s actually old construction dirt mixed with water and affixed to your concrete. A pressure washer removes it. Don’t use CLR if the cement is only a couple of years old. The chemicals can actually etch your cement.
Dark colors can be from roof runoff and your shingles. Again, a pressure washer does a good job.
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.. though we cannot, while we feel deeply, reason shrewdly, yet I doubt if, except when we feel deeply, we can ever comprehend fully."—Ruskin
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