Hi MJ, I don't know why you used Mop and Glo on your tile, but I would recommend getting rid of the residue left behind by the product. Some people use a muriatic acid solution, but I would recommend a diluted bleach solution. Just add a couple of capfuls of bleach to a gallon of water and either mop it on with a sponge or, for best results, let it sit on the area for a few minutes and then wipe it up. Afterwards, rinse the area with clear water and then let it completely dry. Hope this helps!