How can I clean colored grout on kitchen floor
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https://brendid.com/ultimate-guide-to-cleaning-grout-and-tile/
In a spray bottle (quart size ) put 8 0z of peroxide, 8 oz of water, and lastly , 2 tablespoons of original blue dawn. Put lid on and give it a good shake. Spray area until saturated, wait a few minutes and wipe up. It usually works the first time but you may need to repeat for stubborn stains.
https://www.wikihow.com/Clean-Colored-Grout