Happy

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.

Hello!

Heres some other recommended cleaners

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

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

https://www.hometalk.com/41693881/homemade-grout-cleaner-recipe?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/

The Best Way to Clean Grout-EVER!!!

Homemade Grout Cleaner Recipe

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

Hello Caroline,

Use a Steam Cleaner, there really good with this type of job!