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Why is My Shower Grout Turning Black Like Mold?

When moving into a new home, everything from the floor, walls, and ceilings may look clean and neat just as you expected. However, this may change over time especially with frequently used spaces like your bathroom shower. A tile grout turning black like mold is unsightly because it makes your shower look dingy and dirty. Although it can be restored to its original beauty, it is important to know the cause of the problem to find a viable solution. This article gives reasons why your shower grout is turning black like mold and what you can do to solve it.

What Can Cause the Problem?

A shower grout that is turning black like mold is caused by dirt washed from the surrounding tiles. Tile grout is porous and can absorb water and dirt from your cleaning solution.

Black fungus growing on tile joints detail
The amount of dirt that collected from the surrounding tiles finds its way in the small cracks in the grout lines. Another layer of dirt builds up every time you clean your tiles, making your shower grout turn black or darker than before. This does not mean that you do not clean your shower often, since many homeowners strive to keep their bathrooms as clean as possible.

The major reason why your shower grout is turning black lies in the way you clean your tiles. Using too much water or cleaning solution contributes to the problem because it gets enough time to soak into the grout along with dirt. The type of cleaning products used such as ammonia and bleach can also worsen the problem by discoloring the grout. There are instances when your shower grout can be stained permanently and your daily cleaning may not be enough to restore the grout lines to their original color.

Could it Be Mold?

Sometimes you may assume that the black substance on your shower grout is just a layer of dirt only to find later that you have a mold problem. Mold can also be responsible for black grout as it develops in areas with high levels of humidity or moisture. The porous nature of tile grout makes it more susceptible to microscopic growth, especially when combined with constant moisture in the shower. Since you only focus on making the tiles clean, the little amount of water that gets absorbed into the grout encourages mold growth. This means that every time you get rid of the top surface mold, it continues to grow because their roots dig deeper into the grout.

How to Prevent Your Shower Grout From Turning Black

  • Clean Between the Tiles

It is quite difficult to clean your shower grout after every use or during your daily cleaning. Probably because you have a list of chores to do around the house or you do not have the time because of a busy work schedule. When deep cleaning your bathroom, make sure to clean thoroughly between the tiles. A grout brush can help you remove the stains without damaging the surface.

  • Avoid Using Bleach

Bleaching the grout could offer a cleaner look that only lasts for a short while. It only hides potential black mold or layers of dirt that could weaken the grout. Furthermore, bleaching products can cause further damage than good leading to costly repairs in the future. Over time, water will find its way into the cement board causing your tiles to pop out before everything goes downhill.

  • Stay In the Pink

Shower grout absorbs dirt and moisture into its porous surface making your bathroom a breeding ground for bacteria. It is easy to DIY black grout when it is still in the pink zone. However, when it turns from pink to black or brown then a lot of dirt is already inside the grout. The only way to fix this problem is to re-grout, which involves removing the damaged grout and replacing it with a new one.

You can use pressurized water to blast the grime before re-grouting. Once you have spruced up the grout, apply a grout sealer to form a barrier against water, oil, and dirt. Resealing can be done at least once a year to keep your shower grout in good condition.

Professionals use special tools and cleaning solutions to enhance the look of tile and grout. You can find great cleaning solutions from your local store for daily or weekly tile and grout care. Applying a clear coat sealant after re-grouting adds a layer of protection that prevents your grout from turning black. It is important to provide proper care and maintenance to your shower grout to improve hygiene and overall appearance of the bathroom.

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