How do I remove the black moldy looking color from bathtub grout?

Hi Tammy, mold armor is such a great product. I was having a problem with our grout when nothing else worked and mold armor took it right off. They sell different products for different applications. I used a mold armor (mold killer or remover) and then a mold blocker spray afterwards. It is worth a try.

https://www.homedepot.com/s/mold%2520armor%2520products?NCNI-5

You have to remove the grout at this point. The mold spores eat into the grout and no amount of cleaner will get or keep it clean. Use a RESPIRATOR NOT a dust mask. Get a dremel tool or a craftsman multi tool and rout out the old grout and replace with new. Really easy to do. Use a specially made grout cleaner (sold next to the grout in Home Depot) scrub the old grout you did not remove and SEAL all of it. The sealer keeps the mold from re-entering the grout. Use SEVERAL coats using a small brush. Worth the effort.

I would redo the tile and grout if it is financially possible

Hi Tammy - There are several ways to get rid of mold, but most importantly, you need to address the root cause to keep it from returning. This article focuses on the bathroom, but is an overall great article that covers methods of how to remove mold, if bleach is safe to use, and how to prevent it from coming back. Hope this helps! Hugs, Holly

https://pinkfortitude.com/mold-in-the-shower/

PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean

Hello. 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