How to get rid of severe black mold on bathroom grout

“A couple of months after it was built, we got mold spots all over the caulking. The contractor came back and recaulked it. We’re now having the same issue.”source ↗

“I’ve done bleach and Dawn dish soap remedies (separately). It addresses about 80% of it, some of it doesn’t come off.”source ↗

“Recently, I discovered black mold growth on one of the bathroom floors. Could you please provide guidance on effective cleaning methods for this issue?”source ↗

“this black (mold??) is between the shower doors and between the tiles on the walls. Any advice on getting rid of this? I tried cleaning vinegar and baking soda but it won't come off 😭”source ↗

“I think there is mold growing underneath the bottom row of tiles. Any advice would be appreciated!!”source ↗

“pls reply with any materials i will need to look at this myself like do i need a mask and goggles to check ts out up close????”source ↗

“I’ve tried bleach and several ready-to-use mold/mildew removers (i tried scrubbing, letting it stay overnight and then scrub), but nothing seems to work.”source ↗

“How can I get rid of these stubborn mold stains on grout / hard water sediments on tile floor?”source ↗

“In some places, the grout turns yellow, how can I make it white ?”source ↗

“I'm moving out and trying to clean before inspection and I can't get this black stuff out.”source ↗

“So my shower is tiled, and the goute between is turning black. How can I clean this up? I've tried spraying it with cleaners, scrubbing at it, with a brush, and even pouring bleach on it.”source ↗

“Yikes, I really hope it doesn't come to breaking down the wall! 🙈 I'll definitely inspect everything I can first, thanks for the heads up!”source ↗

“Oh no, that sounds like a total nightmare 😭 I'm looking into getting a dehumidifier today to slow it down while I figure out what to replace. Thanks for the honest advice! 🙏”source ↗

“Everyone says peroxide, but I'm honestly at the point where I'm scraping up grout scrubbing so much. Hopefully you find a way. I fear I'll have to regrout which seems like a daunting, labor intensive task”source ↗

“When I read up on this in the past you'll need to scrape the old caulk and re caulk it. But I'm following for advise as well !”source ↗

“Water is getting under the tiles which means this wasnt sealed properly.”source ↗

“i just moved into an apartment with this issue and would love to know the answer. baking soda proved unsuccessful for me in addition to the things you tried.”source ↗

“Mold or mildew has been appearing the last couple years along the caulk at the bottom of the shower.”source ↗

“The mold on the bathroom grout is plenty and completely black.”source ↗

“I don’t think normal cleaning products will work but my landlord said that is what he purchased to fixed more than a week ago with no fix.”source ↗

“Should I try to regrout it? Is that a thing?”source ↗

“How can I make the grout look new again? Bleaching is not helping. Would a grout pen be enough or does the old grout need to be completly removed and replaced ?”source ↗

“We all of a sudden have been getting some black mold in various grout spots on the shower floor.”source ↗

“I cleaned it with Laticrete Stonetech Tile and Grout Cleaner which helped for a few weeks but now new areas are popping up.”source ↗

“We have a small bathroom with no window and poor ventilation, which has caused quite a lot of mold on the walls, ceiling, and grout.”source ↗

“Is this something we can DIY? What’s the correct order of steps, and what products would you recommend, especially ones available in Israel?”source ↗

“Also, should we clean the grout or replace it?”source ↗

“tried bleach but it came right back. the tile and grout cleaner worked but new places are popping up. I am afraid to reseal it even though I think its the issue becuase I dont want to trap mold under it.”source ↗