Help: My kitchen flooring is a type of tile (not ceramic) and I am unable to bet it really clean and white with comercial cleaner. I'm not sure what brand it is as it was here when the house was purchased (looks like Armstrong). The bathrooms are the same flooring and they are clean and white. However, I'm unable to get the "dirty" look from the kitchen floor. What do you suggest. I've tried everything I know of except pure amonia.