Baking Soda and Peroxide for Cleaning Grout

I have always used baking soda and peroxide in the spray bottle with some warm water and a scrub brush and it works wonders! Spray it and scrub it. It gets the grout very clean, the white will be very very white. I clean grout that you had no idea what color it was underneath and it ended up being white. It went from black to white with a little bit of elbow grease. I'm sorry I don't have any pictures