Tile sealant, use several coats, and protects the grout from staining, and mildew.
I feel your pain Yvonne . I had the same question years ago and I used a product that was supposed to make the tile shine . It did ... until it started to wear from walking. So then I had to strip the whole floor to apply again only for it to happen again !!!! I say don't do it.
Hi ! I usually use either glass cleaner or vinegar and water . I tend to use a squeegee, if there is any dampness left you can use a cloth or paper towel on it .