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What Causes Mold on Windows?

window cleaning

Doing what you can to prevent mold from growing can help you preserve your property’s condition. However, you may not be looking hard enough in places that you may not think are susceptible to mold growth. One of which is your windows. 

Windows are often not the first thing you check when performing mold inspection because we were trained to think that this fungus typically thrives in warm, damp places. But as you will see through this article, there are some things you need to work on. Feel free to use all the information mentioned below for your proper guidance. 

How Can Mold Grow on My Windows When They’re Constantly Exposed to Sunlight? 

You may be curious about how mold can become worse on windows since they are constantly exposed to sunlight, which can be mold spores’ natural enemy. However, take note that what contributes to mold growth is the accumulation of dirt and dust from indoors. In particular, mold spores can sustain themselves when consuming bacteria, dust mites, dead skin cells, hair, pollen, and even some plastic particles. It means that even if they are exposed to heat, they can still grow, and they may even thrive faster.

The most common mold you can see on windows is black mold. It is a fungus that multiplies when you open the windows during the spring. It’s been growing during the cold months in fall and winter as it feeds on contaminants. Since sunlight is also not as prominent, there is room to grow and spread around the houses, primarily through your heating system. 

How Can I Prevent Mold from Growing on My Windows? 

If you want to avoid mold from growing on your windows, you should inspect your window sills, the glass, and the frames. Typically, the hiding place for mold is inside the sills and frames made of wood or aluminum since the mold spores can seep in. The glass is resistant to mold damage, but it can accumulate in the windowpanes and hide there to avoid direct sunlight. 

You should always clean your windows once a week with soapy water and a damp cloth. If you want to get into the nooks and crannies, you can use a toothbrush. You can also use your vacuum cleaner for an extra thorough clean. Just ensure you attach the tiniest nozzle to suck out all the dust. Because mold growth is highly possible during the colder months, you may want to do biweekly cleaning and have mold abatement specialists inspect your windows during the spring. 

How Can I Remove Mold on My Windows? 

You can address minor issues with mold growing in your windows since it’s normally not as serious as it would be for other complications, like in spaces with intense water damage due to flooding. All you need are the following: mild bleach, a face mask, gloves, clean rags, a trash can, and some warm water.

First, you should mix the warm water with one cap filled with bleach. After that, you can wear a face mask and gloves. Then, you can dip the clean rag in the water-bleach solution and use it on the moldy areas. Make sure to have your trash can ready to dispose of the dirty rags to reduce the risk of spreading the mold spores around your property. You may also have to do this twice a week for all mold-filled windows until the mold is gone. 

If you find that the mold from the windows has transferred to drywall or sheetrock, don’t hesitate to call mold abatement professionals since cleaning it by yourself won’t address the issue properly. 


Even if window mold may not be given much concern or can easily be dealt with, you shouldn’t overlook it since doing so can endanger anyone on your property. If you feel that you cannot handle the mold situation on your own, seek professional assistance from experts like us. 

We at AAA Restoration can provide you with the best mold abatement services in Utah. We also do flood restoration, asbestos testing, and other restoration solutions for your convenience. Contact us today to keep your space safe and look after everyone’s best interests.