Tried it out this morning on my dogs' high traffic/slobber area, worked well! DIY grout cleaner, 5'x6' area. 1/4 cup bleach & 3/4 cup baking soda to create a nice thick paste.Use an old toothbrush and scub. Let it sit for ten minutes, then wipe clean with a rag and hot water (rinse rag constantly).
Homemade Grout Cleaner- Getting down on all fours to scrub out your tub while breathing in toxic fumes is not fun. As one can imagine, inhaling these chemicals is not good for your lungs. Make your own homemade grout cleaner mixing up a ratio of 1/2 cup of baking soda, 1/4 cup hydrogen peroxide, and 1 teaspoon of liquid dish soap. Shake it all up and watch your grout lines restore to their original condition.
Best grout cleaner out there and its for carpet! Resolve carpet foam. Spray it on. Leave for 10 min. Scrub it off with a stiff scrub brush! Wha la!! :)) Tip:as you scrub wipe the dirt that comes up off. If you don't it will just soak back in before you get back to mop it off.