Newly poured concrete has dark spots and streaks throughout..HELP!
The day they installed the concrete it was hot about 80 degrees and very windy. They applied a top cast per our request to expose some aggregate and left that to dry overnight. In the morning, they used a power washing and broom to clean the top cast off. After asking about the dark streaks in some area they told me they would clean them with acid, but I believe they applied acid and power washed the entire patio, which ended up creating more streaks and newly formed brush marks.
We still have money on the table that we have not paid them. The licensed contractors suggestion to remove the dark spots shown in the picture is to use a sand blaster. He said another round of acid would be too strong. Does anyone have experience with sand blasting? Will this help? Any other methods you would suggest?
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