Unsealed slate cloudy/hazey after grouting

Hi there, we recently had a backsplash installed in our kitchen - 1 inch natural stone tiles with a border of 2 inch multicolored slate. We have not sealed or applied anything to it. It looks a tad bit "hazey" or cloudy....from the grout? Wondering how to clean this off or what step to take next before sealing? I have read your website and wonder if a color-enhancer would be appropriate in this case? Or a grout releaser? Thank you!