I have laid and grouted ceramic floor tiles using what the makers describe as a polymer grout which I understand has no cement content. Although I wiped the tile surface almost immediately, there is some marking which I can't seem to remove. This marking isn't solid grout, just a polymer haze in unsightly patches. Most tile cleaners seem to concentrate on removing cement-based grouts or epoxys. Can anyone suggest a product I can use please because otherwise it's expensive working through the alphabet!