Hi, Please help! Never having had ceramic flooring before and moving into our current home which has 80% ceramic tile, we had no idea that we should never use soap as a cleaner only clear water. Our grouting is now a gray color. Is there a special cleaner for this to remove the gray or do we have to incur the cost of having this cleaned professionally? Do you know of any moderately priced equipment that could be purchased in the way of steamers that you would recommend? Thanks for your kind attention to these questions.