We have tile floors with light-colored grout throughout much of our house. Thankfully, most of it has stayed pretty clean. The heavy-traffic areas, though—particularly the kitchen—have taken a bit of a beating. While we wash the floors regularly and had tried cleaning the grout, it still looked discolored.
I try to stay away from using chemicals, and the website, One Good Thing by Jillee, offered some suggestions for cleaning grout using household items. Jillee had tried several different methods and liked this one the best. I used it on our kitchen floor and got the results shown above. It was quick (about 1 ½ hours from start-to-finish), easy, and inexpensive.
Btw, I have found that the One Good Thing by Jillee website offers many practical and effective household suggestions and solutions–pull it up if you have a household challenge.
Grout Cleaner: Make a paste of hydrogen peroxide and baking soda. Spread on the grout and let sit for an hour. Scrub with a grout brush, a toothbrush, or the scouring side of a sponge. Wipe with a clean, damp cloth.
In the interest of full disclosure, Jillee felt that while this method was effective, it was very messy, particularly if you planned to use it on the whole floor. I didn’t think it was that bad but I worked on small sections at a time. Cleaning the whole floor at once could be quite a challenge–I would recommend that you clean the grout in sections.