just used this method to clean a stubborn stain on my carpet that has been steam cleaned and spot cleaned multiple times. I can't believe how much dirt my white cloth came up with!!! Wish I would have taken my own before and after pics. It took all of 20 minutes and that inludes the 10 minutes for the baking soda to sit and time to mix the solution!!
DIY Grout Cleaner 7 cups water ½ cup baking soda ⅓ cup lemon juice (or ammonia) ¼ cup vinegar
Green & Thrifty Cleaning Products | 10 Homemade Cleaner Recipes