I was not sure this product would do what it says it will do, DOES IT EVER! My ugly grout looks brand new. It looks so good, I keep looking at it in amazement. I have lived with my ugly grout for 3 years. I can not remember ever being so impressed with a product. This stuff does EXACTLY what they say it will do. For less than thirty dollars and a few hours of simple work I have beautiful floors. Thank you to the inventor of this simple solution. I am not a review writer, however I had to give some love to this stuff. WELL DONE.