We recently purchased our first home and the flooring throughout the kitchen/ dining room & laundry room was white tile with white grout. The previous owner probably gave up trying to scrub the grout clean, so area rugs were used to cover large areas and the rest of the flooring was very stained. No cleaner I tried would whiten the grout, except resorting to SoftScrub and a good scrub brush – and some areas could never be whitened no matter what I tried. After some research, I found your product online and was skeptical. After reading all the testimonials and watching the videos, I decided to purchase a kit. I spent nearly an entire Saturday on my hands and knees to complete my kitchen & dining room floor, but the results are fantastic! I can’t comment on how the product will perform long-term, but for now I am very pleased to say the least. The before and after photos tell the story of what I was dealing with. This before photo is of the laundry room that I will be sealing in the near future. The staining was very similar through the entire floor.