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https://www.hometalk.com/search/posts?filter=clean%20grout
https://www.todayshomeowner.com/video/tips-on-cleaning-grout-lines-on-tile-floors/
I mop with this solution:
1 cup white vinegar
1 cup baking soda
1 Tbsp blue Dawn
1 gallon hot tap water
1 gallon boiling water
Mop liberally with solution. If you need to scrub you can use a clean broom or scrub brush to get into the grout lines.
https://yourproplumber.com/moisture-coming-up-through-concrete-floor/
I tried every cleaning tip & trick for cleaning the grout in my new-to-me home and I finally gave up. I finally decided the only way to make it look new again was to paint the grout with grout paint (I got it at Lowes or Home Depot). The grout paint was easy to apply---you don't have to worry with painting straight lines because the excess paint on the tiles just gets wiped off---the paint adheres only to the grout. The paint has a built-in sealer. Did both my bathroom floors last year and they are still gleaming. Best decision ever.
My dark charcoal grout on the kitchen floor is cleaned with a steam mop. It looks great after 27 years.
Use Clorox toilet bowl cleaner. The spout on the top allows you to squirt right in the grout groove. Let it set about 15 minutes scrip a belt with a brush ...then mop....clean tile and grout.
I used it on my grey grout in my kitchen and bathroom with out a problem.....wonder why you had a problem?
If cleaning doesn't work you can buy Polyblend Grout Renew all in one colorant and grout sealer. Use a small paint brush and follow directions.
In my practice, sometimes homemade methods cannot give you a good and high-quality result. Consider a local contractor who can do professional grout cleaning in your city.
Here are several tips and tricks that might help you https://chascrazycreations.com/floor-cleaning-hacks/
Scrub them with tilex bathroom cleaner. A narrow brush will help you get into small grout lines.