Blue plastic dust?

Has anyone ever seen this before? It is the bottom right corner window on a 2 story with vinyl siding. The sheathing was blue/green. Is this from termites or ants? Most of the blue dust/shavings were on the inside of the window, but there was some on the exterior as well and it was only on the left side. Thanks for any help. They are having pest control company to check it out.