Posted by John on November 28th, 2012
Keeping with our bathroom theme… Unless you routinely scrub your tub or shower, you’re bound to get a good amount of black moldy build-up in those tough to clean areas. We’ve all seen it. Sorry if I’m starting to sounding like a commercial. It happens. It comes from years of trying to sell my ideas to Lisa. So, our master bathroom shower has seen some better days. Surprisingly, we actually DO clean it often enough that we shouldn’t have any issues with black staining mold or hard water stains, but nonetheless we do. Here’s how I was able to get our shower mold free and looking new.
How to Clean Black Shower Mold Permanently
First, I always start with a cleaning product that contains bleach. We typically use Tilex. The chemical odor can be pretty overwhelming, so whenever I use it, I try to keep the windows open to let some fresh air in and wear a mask I aggressively work the cleaner into the problems areas with a stiff bristle brush. If you still have some black mold after this step, then you’ll need to remove and replace the caulk.
Here’s what our shower looked like after the best cleaning it’s ever gotten.
Still pretty gross. To remove the moldy caulk, I used a box cutter with a sharp blade and a flat bladed box cutter, which is like a window scraper, to score it. Once all the caulk was scored, you can usually peel it out. Be sure to get all of the caulk out of the joints. Some of the more stubborn caulk may harden to the point that it’s like grout. The hardened stuff may need some more persuasion. I used a flat head screw driver. You do need to be careful that you don’t damage your tile or shower basin. Also, wear safety glasses. Proceed with caution and at your own risk.
Once all the moldy caulk was scraped out, it looked better.
With all the caulk removed, it’s time to prep for the new caulk. Be sure to clean up the area where the caulk was previously. It will also need to be nice and dry in order for any caulk to adhere well.
Now, if this were a latex based painter’s caulk, I’d dive right in. The latex caulks are pretty easy to work with and are fairly forgiving. However, your shower and bathroom applications require a silicone based caulk. Silicone caulk is notoriously difficult. So, to make it easier on ourselves, we’re going to use some painter’s tape to mask off the area. I leave a good 1/4″ gap in the area where the caulk will be applied.
Once the tape is in place, we’re set. Now, you can buy high quality silicone caulks that are specifically designed for a shower or bathroom application, as opposed to a window or door for example. The caulk we used for this repair guarantees several years free of mold. Hopefully, with normal cleanings, we won’t need to repeat this procedure.
The caulk can be applied in a thin bead and can then be smeared with your finger.
While smearing, I try to get a seamless look. Pull your finger smoothly across the caulk line and don’t stop until you get to a corner. Once you’ve smoothed all the caulk, remove the tape. Very gently, re-smooth out the caulk lines again. You’re done. Let it dry according to the caulk manufacturer’s directions. You usually need to wait around 8 hours after you apply the caulk until you can shower.
Now, my assumption is the builder didn’t use a high quality caulk the first time around. We’re going to be more vigilant this time and hopefully can clean the shower with a less caustic cleaner, but I’m hoping I won’t need to repeat this for a long, long time. And if you do spot some small black mold spots in your caulk, don’t fret. Try letting the Tilex cleaner soak for a little while (few minutes) before you plan on re-doing it.
The hardest part of this whole process is removing the old caulk. Plan on this whole fix taking at least a couple of hours. It will be time well spent.
Anyone else dealing with some crappy caulk? I wrote an entire post about caulk and didn’t make one juvenile joke. #itskillingme