Granite Streaks

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We received this question from a reader:

Q. Today a Zimbabwe granite counter was installed in our kitchen. It was thereafter cleaned by a house cleaning company, I presume with regular cleaning material. Afterwards it showed stripes which we can’t get out anymore. We only tried with water, as we did not dare to use any strong material. Please advise if and how we can solve this.

A. You will need to ask your stone fabricator as they probably used a sealer on the stone and you will want to make sure that the cleaning products you use are compatible with their sealer. On stone finished with our sealer, we use a glass cleaning product (Windex) for difficult streaks.