How do I clean grout in a kitchen with porcelain floors?

Steam clean or mixture of oxy ckean and bleach

I use vinegar and warm water and scrub. Not easy but works, you can also try a steamer, but I would test it first.

Heres some other recommended cleaners

The Best Way to Clean Grout-EVER!!! | Hometalk

https://www.hometalk.com/diy/clean/bathroom/the-best-way-to-clean-grout-ever-2295735?expand_all_questions=1

https://www.hometalk.com/diy/clean/floors/homemade-grout-cleaner-recipe-41693881?expand_all_questions=1

https://www.bobvila.com/articles/cleaning-grout/#.Wi6YzKZOmf0

https://www.hometalk.com/search/posts?filter=clean%20grout

Additionally

Painted Tile Grout Refresh with grout pen

https://www.blesserhouse.com/painted-tile-grout-refresh/

Grout cleaning and grout removal and replace it

Here’s a Hometalk link for you to consider. Hope this helps

https://www.hometalk.com/diy/clean/bathroom/how-to-clean-grout-and-install-new-grout-that-won-t-stain-23803774

This product works well for both tile and grout: https://amzn.to/34yOt0E

Hope this Helps! Jeremy - https://do-daddy.com

1. Remove surface dirt with hot water and a towel.
2. Mix together ½ cup baking soda, ¼ cup hydrogen peroxide, 1 tsp dish soap.
3. Spoon cleaning agents onto grout and let sit for 5-10 minutes.
4. Scrub the grout lines with a brush. ...
5. Wipe clean.

This is how I do it: How to Clean Grout

1. Remove surface dirt with hot water and a towel.
2. Mix together ½ cup baking soda, ¼ cup hydrogen peroxide, 1 tsp dish soap.
3. Spoon cleaning agents onto grout and let sit for 5-10 minutes.
4. Scrub the grout lines with a brush. ...
5. Wipe clean.