Do you know an easy way to 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
Painted Tile Grout Refresh with grout pen
Grout cleaning and grout removal and replace it
Here’s a Hometalk link for you to consider. Hope this helps