Is there a permanent solution for mold and mildew growth in my shower despite repeated cleaning and recaulking?
Asked by Isabelina Novaes 
6 months ago
Last Updated: June 21, 2024
Hey everyone,
I’ve gone through the whole process of stripping, cleaning, bleaching, and re-caulking my shower three times already. But no matter what I do, after a few months, I always notice new mold or mildew creeping back in. The last time I even used a really good GE Silicone that’s supposed to be clear. It seems like whatever is growing is lurking beneath the sealant. Is there a long-term fix for this issue? It’s driving me crazy.
I don’t think bleach can effectively eliminate mold on porous surfaces like tile and grout. I suggest using vinegar or hydrogen peroxide instead to spray or blot generously, let it sit for 10-15 minutes, then rinse. Afterward, you can use bleach to get rid of mold stains. Make sure to wait at least 12 hours for it to dry before applying caulking.
Yes, ! 🙂 Just like I mentioned before, bleach isn’t very effective at eliminating mold on porous surfaces such as the bottom of tile and grout
In my experience, clear caulking tends to develop mold more quickly. It seems like water is collecting on the silicone based on the picture, leading to mold growth.
Before anything else, address the root cause of the issue. It’s clear that there is a moisture problem that must be resolved. Without fixing that, the mold will keep coming back regardless of what you do to remove it.
Take out the silicone and allow it to air dry for a few days (or a week if possible). Try placing a dehumidifier in the area to speed up the drying process. Once all the moisture is gone, reapply the silicone.
Time to demolish
I would be wary of water damage behind your tiles. When were they installed?
Looks like the shower pan is too level; this is definitely going to be a challenge.
Seems like the issue is originating from the wall in the photo, there might be water damage hidden back there
Just a heads up – bleach may only remove the surface layer of visible mold and spores. Some studies suggest that the residue left behind after offgassing can actually promote rapid mold growth. It’s always best to thoroughly address the issue.
When dealing with mold under tile, TSP can be effective in killing it. For shower floor renovations, using a tray base instead of tile is recommended.
Regular caulk and silicone tend to develop mold in environments with high moisture levels. I faced the same issue and replaced it just like you did but still had the same problem. Finally stumbled upon this solution. After using it, my surfaces have been mold-free for almost 2 years now. This product is exactly what you need. Make sure to remove the existing caulk and thoroughly clean the area with bleach before resealing it with this. Problem solved! 👍🏼
If you’re unsure, it’s best to just remove the problematic area. Demo it out.
I had a similar experience with moisture seeping behind the walls in my previous home.
My situation is very similar – the tile behind my shower head looks dry and mold-free, even though water seems to be getting behind the silicone sealant.
It’s possible that there is mold growing behind the tile due to improper installation.
You might want to consider using this type of caulk. It dries somewhat hard and allows for expansion.
Consider getting an automatic ventilation fan that kicks in when the humidity goes above 40%. Make sure to vent it outside, ideally through the roof.
Ozone generator
I actually have a pretty good fan in that room. The issue is that it’s all over the place, even with no wall behind it. I’ll give some of those suggestions a shot.
Oh no, you’ve got a water leak. I had a similar issue. Make sure to thoroughly inspect for any hairline cracks.