How do I clean the grout in a very large kitchen with porcelain tile? The grout was never sealed.
Lysol Lime & Rust Remover Toilet Bowl cleaner, comes in a black squirt bottle. Scrub with Scrub Daddy or Mr. Clean Magic Eraser. Seal once you get it clean.
If you give up, you can paint it and then seal it.
Heres some other recommended cleaners
The Best Way to Clean Grout-EVER!!! | Hometalk
Painted Tile Grout Refresh with grout pen
AFTER you get your grout clean-- the way you want it to look --- SEAL IT FOREVER using grout sealer!! Follow the directions TO THE LETTER!!! You'll never have that problem again ... GOOD LUCK with your project.
I would rent a machine at the local store that cleans grout...almost like powerwash
Clorox cleanup scrub brush
Then seal with silicone get it on eBay it’s in a bottle like she polish works great
Use a Steam Cleaner, there really good with this type of job!