How to remove dark spots from new concrete patio?

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We just had a new concrete patio poured yesterday morning. I asked the contractor before he left if we needed to worry about rain. He said no. It did start to rain shortly after they left. It didn't rain long. But after the rain was done, we noticed spots all over the patio. We contacted them and asked if this would go away. They said it was moisture spots and should go away. Today, the patio is much lighter as it is drying, but the dark spots have not gone away. Does anyone know what these are and if they will go away? Just didn't know if this was something I should have the contractor address or not. I don't know concrete, but this is ugly. Thank you ahead of time.

q how to remove dark spots from new concrete patio
q how to remove dark spots from new concrete patio
q how to remove dark spots from new concrete patio
  15 answers