It has developed a white haze over the entire sink

It has developed a white haze over the entire sink Images

It has developed a white haze over the entire sink

It has developed a white haze over the entire sink Description

I have a black sink that I purchased at Home Depot last December. I believe it is either Granite (http://tanbrown.org) or slate. I am not sure which. It has developed a white haze over the entire sink. I thought it was a mineral build up from my water, but nothing will remove it. I even tried vinegar. Any ideas?
Dawn Kern.

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