Call several cement companies and ask if there is any thing you can buy to remove the spots. If there is such a product and it's so expensive to buy, you can probably live with it.
If your home has a concrete cellar/basement, you can always paint the floor with concrete paint if you want to hide the spots.
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I had a holder handmade in Africa which I used to put a plant in and set it on the cement in front of the fireplace. It was too full of water and ran onto the cement and the color bled onto the cement. I tried to clean it off with oxi-clean but it left a stain. Is there something I can use to clean cement?
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