I clean it with a mixture of vinegar and water (1:10). Use a deck brush to put it on and lightly scrub, then give a warm water rinse.
I use vinegar and baking soda. It even removes rust.
try this: https://www.craftylittlegnome.com/the-best-homemade-grout-cleaner/
Hi Georgietta - This is the shower cleaner that we use to help keep grout and tiles clean and minimize the mildew - it works on kitchen grout too. I've also included a great article about mold if it's gone that far. Hope this helps! Hugs, Holly
PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean
I clean mine using a swiffer
Degrease them with Awesome cleaner from the Dollar store.
To get your grout white again make a paste with peroxide and baking soda. Scrub it into the grout and leave it. Then rinse it and it will be white.