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Black Mold in Bathtub: How to Get Rid of Them? (Explained)

A damp, cozy atmosphere is needed for black mold to grow. Black molds begin to spread by budding and generating spores when they discover any convenient place, which is unclean, damp, greasy, oily and where sunlight, airflow can not reach. They are harmful for health. 

What causes black mold in the bathtub?

A few factors play a vital role for the growth of black mold in the bathtub. Continuous moisture, humid temperature, poor sunlight, less air and dirt is required for their growth which a bathtub can fulfill. Lack of ventilation is another reason for the mold to grow inside the bathtub. 

Black mold is normally seen outside of damp or wet areas after a long rain but they can even attract indoors if they find any source of numerous gastrointestinal ailments that is required for their growth.

Mold can be seen growing in the bathtub as it has moisture for most of the time which eventually supports and facilitates the molds’ rapid growth. 

In fact, mold typically flourishes in certain places where there is a lot of dust, grease, less air and dirty materials. If the bathtub remains dirty for a long period of time they eagerly tend to build up there.

Moreover, they find the place humid that has less to no sunlight, less airflow which is suitable for their growth. Actually, as the bathtub fulfills all their basic requirements, they grow in the bathtub. 


Humid or cozy atmosphere is typically necessary for mold to build up. Humidity facilities mold to spread and build their colony easily.

As the bathtub has water almost all the time, humid air circulates in it continuously and so, mold finds the place favorable for them and grows up. 

Poor ventilation:

Mold mostly thrive in places that have less air or poor ventilation. It’s because proper airflow helps to make a place dry soon but it is the moisture that is required for their growth.

As the bathtub is placed in the washroom that has no way to air flow, mold attracts in it. 

Less sunlight:

Mold dislikes sunlight. They search places that have less air and where sunlight can’t reach. Actually the reason is, sunlight emits photons that are enough to terminate them. As sunlight can’t enter the washroom, mold finds it convenient. 

How to get rid of black mold in the bathtub?

Molds can typically flourish in the bathtub that poses a high risk for health. Cleaning with hot water regularly with active ingredients can rid mold. Iodine tincture and bleach are potent chemical solutions to remove mold. By reducing pH level, vinegar also can actively terminate mold. 

Molds are tenacious organisms that require frequent cleaning and sufficient fresh air accumulation in the bathroom areas in order to eradicate.

Cleaning with hot water will raise the temperature of the bathtub surface, which will make it harder for mold to grow because hot water breaks down the molds’ cell walls. Baking soda and vinegar solutions are also beneficial for this task. 

As a result of the bathroom’s constant exposure to moisture, humidity, and a lack of ventilation, mold is frequently found there.

As a result, it’s important to take precautions to stop mold growth, such as using strong chemical solutions like bleach and chlorine in the bathtub and cleaning it frequently.

Mold cannot thrive in acidic environments, so reducing the pH of the bathroom surface with phenol or Dettol solutions will prevent the growth of mold. 

Use of iodine tincture:

Mold-fighting iodine tincture is a potent chemical solution. The bathtub is a preferred site for mold to grow.

However, using a solution mixed with a tincture of iodine will terminate the molds by 90% since iodine has mold repellent activity. Therefore, frequently applying this solution in every part of the bathroom and bathtub is effective in getting rid of mold. 

Using hot water and a vinegar solution to clean:

Mold removal from the bathtub can be done temporarily with vinegar. Cleaning with an acidic element like vinegar will not only eliminate mold spores but will assist in doing so.

Since vinegar won’t completely disinfect against mold, it needs to be applied frequently. To remove mold from the bathtub and the bathroom, take a clean towel and a vinegar solution and massage them simultaneously. 

6% Glutaraldehyde Solution:

Glutaraldehyde solutions are effective at terminating mold spores when diluted to a concentration of 6% to 10%.

To begin, take a clean bottle, fill it two-thirds with water, add the 6% concentrated glutaraldehyde, vigorously shake it, and wait a few hours for the ingredients to mix. Use a clean cloth and this solution to clean every surface of the bathtub.

You can also spray the solution in the air and at each corner to help eliminate airborne spores and surface mold. 

The mold is destroyed when this reacts with the mold’s cell wall, creating pores and causing all of the mold’s cell components to protrude.

A weekly cleaning with this solution is sufficient to get rid of the resilient mold and spores because it is a powerful solution. Applying this solution requires caution because it has the potential to cause skin lesions due to its strength. 

Using bleach:

Bleach solution can be used to get rid of mold because it releases active chlorine, which interacts with the mold’s cell walls to break them down and create pores in the cells.

Making a potent bleach concentrate solution and sprinkling it every two to three days in every corner of the bathroom can therefore help to quickly get rid of mold. 

Using baking soda to clean:

Mold can also be removed by mopping with baking soda.

Molds can be removed from a bathtub by filling a spray bottle two thirds of the way with water, adding baking soda, thoroughly mixing it, and spraying the entire bathtub with this solution.

What does bathtub mold look like?

Mold is one of the microorganisms found in most of the wet, damp, soggy areas. In fact, they can grow household things like a bathtub if they find their proper needs in it. The place where they grow looks like a highly concentrated area.

It typically looks like a thin layer of dirt in a weird color. However, the color varies depending on its species, form, or the infected time. 

Black mold in bathtub caulking:

Black mold grows in the silicone bathtub in a thin gray kind of layer or as a spot. It looks very soggy. The caulking turns into black and becomes darker day by day. 

Black mold in bathtub drain:

Black mold can be seen in small patches in slimy dark brown or greenish appearance in bathtub drain. The area starts to fade away and becomes discolored within a few days. 

Is black mold in the bathtub dangerous?

Microorganisms including bacteria, fungi or mold all are harmful for health. In fact, they can make you severely sick depending on the species.

Black mold is the most harmful species among other molds. Like other mold, they also grow in a colony in the bathtub but are hard to remove. The mycotoxins they generate and byproducts they produce can make you sick as they are toxic. 

Black mold can be visible as a black or gray spots but its spores are numerous and fly in the air. If the spores get inhaled by breathing, they will infect the lung and respiratory system.

Also, the mycotoxins they generate can cause stomach disturbance, vomiting if consumed in any way. In fact, while bathing if it gets touch on the skin, it’ll cause allergies or skin rashes and make you go through a lot. 

How to prevent black mold in the bathtub from coming back?

Molds will return if the bathtub area is not cleaned frequently, and dampness and poor ventilation will also cause the molds to grow. They may be in a dormant state and waiting for a chance whenever they find a suitable environment.

For this reason, it is important to take preventative measures to stop the growth of mold, such as spraying disinfectant solutions frequently. The bathtub should always be left as dry as possible after use by mopping with a dry cloth.

Maintaining enough ventilation:

Because mold is continually hunting for places where there is no light or fresh air, ventilation in the bathroom is essential. Mold will endure and come back if the bathroom’s airflow is insufficient.

Because sunlight helps to terminate the mold and prevent its regrowth, try to leave the bathroom window open for most of the day to prevent the mold from returning on a regular basis.

Spraying with a disinfectant:

Cleaning with dettol or bleach solutions every three to four days and repeating the procedure to stop the mold from growing again is effective.

Disinfectants are useful to use against molds, particularly the disinfectant that lowers the surface pH below four, as molds cannot survive at a low pH.

Periodically sanitize the bathroom:

Cleaning is necessary to prevent the growth of mold.

It is important to keep the bathtub clean after each use because mold grows best in filthy settings and relies on that dirt to survive for several days. Cleaning is thus necessary to get rid of mold.

Final thoughts

Cozy atmosphere, less air and poor sunlight are necessary for black mold to grow that the bathtub allows. They’re difficult to get rid of but regularly cleaning with hot water and active chemical ingredients will work. Mold can be harmful for health so preventive measures are required to take.