Maintaining a beautiful tile floor is hard to do when you have pets in the home. Pet dander and dirt can build up easily in the grout if not regularly cleaned. It's easy to let it go since you have no time to get down on your hands and knees to struggle through the clean up job, and pets require you to clean grout more often than homes without pets. Just cleaning the surface doesn't do it. You need a product that will get down into the grout line and remove all of the dirt, grime, bacteria, fungi and pet dander left behind. If you have not cleaned your grout regularly it will take some effort the first time to get it really clean but maintaining it each week with grout express keeps it looking new and beautiful.