Hi all, I am closing on a new house in 2 days. As I recently saw the house, there are odd stains around the cut lines on the newly laid cement. It almost looks like bleech lines (whitish pink) that are about 8-12 inches wide and follow the cut lines.

I live in midwest and cement was laid in 40 degree weather (not sure that matters).

Builder claims these lines will fade, however, I feel light debris in the stains, and no so confident they will fade.

Can anyone provide some information if my worries are real, or if these lines will truly fade?