I don't know how well this works, but a friend posted this recipe on Facebook.
Green Spring Cleaning Recipe for the Grout
7 cups water
1/2 cup baking soda
1/3 cup lemon juice
1/4 cup vinegar
throw in a spray bottle and spray your floor, let it sit fora minute or two... then scrub
I've used Mapei Grout Refresh (http://www.mapei.com/us-en/product-detail.asp?IDProdotto=1005815&IDTipo=162&IDLinea=102), which is available at Home Depot and Lowe's, with success. Mapei Grout Refresh is basically a paint that covers up the stained grout. I was happy with the results. I used it in 3 bathrooms and my kitchen.
The ONLY thing I use on my kitchen floor, ceramic tile with white grout, is white vinegar and baking soda. Works like a charm. Only a man would have chosen this tile~not smooth. Pour vinegar directly on floor and sprinkle the baking soda on it. Let sit at least 15 minutes, more is better. I use a brush on a long handle, like from carpet cleaning. Cleans up beautifully. Just be sure to rinse until water is clear.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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Here's an answer that might help - https://chascrazycreations.com/easy-eco-cleaning-hacks-on-a-budget-for-your-home/