My husband grouted the new glass peel and stick tile on our backsplash in the kitchen. By the time he finished it was late and he said all we needed was elbow grease to remove the stains. Next day the countertop looks awful, attempted elbow grease no to avail. Is there a product I can use to easily remove these stains?

In addition, he put too much grout on tile while grouting and there is a lot of the white mosaic tile with grout haze. How can we effectively remove the grout haze on the newly grouted tile. So unhappy