Pinner says...."My carpets are so gross with 3 kids" carpet cleaner - Awesome! Should've done before/after pics, but I had 3 almost black stains on my off-white carpet and they came up beautifully! Had to do it twice, but they had been there a LONG time and were really ground in. 2cups hydrogen peroxide and 1/4 cup baking soda. Put in a spray bottle squirt- scrub- vacuum!
1/4cup bleach, 3/4cup baking soda, old toothbrush. I put it on the cracks and let sit for an hr took a brush scrubbed it off didn't have to scrub hard just had to get the harded mixture off and rinsed hot water and my tiles and grout super white