As someone who's always skeptical of products claiming to be "revolutionary," I was pleasantly surprised by this grout cleaner.As a result of my tests, I determined that it's incredibly effective at getting rid of mildew and discoloration. I also appreciate that its eco-friendly and safe for use in health and household settings. However, the smell is A bit strong and may require ventilation. Overall, I highly recommend this product for anyone looking for a reliable and safe grout cleaner..See full review