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Why is my Toilet Seat Turning Blue?

If you’ve been living in the same house for a while, you might notice your toilet seat sometimes turning brown, yellow, or black, because of one issue or the other, all of which are easily detectable. But if your toilet seat starts turning a light-blue color, that might pose a bit of a problem, because there are very specific reasons why your toilet seat could turn blue.

Why is my toilet seat turning blue? Your toilet seat could be turning blue because of a potential increase in hormones throughout your body such as in pregnancy, or from chromhidrosis, both of which are medical conditions. Another reason could be blue dye retained on your thighs or bacteria that interacts with colored dye remaining on the toilet seat.

Stay till the end of the article to know about the reasons why your toilet seat might be turning blue, as well as the remedies you can use to reverse the color back to normal. First, let’s discuss all the reasons why your toilet seat is turning blue.


This is a medical condition that produces colored sweat for the person who has it. Although this condition is extremely rare, there have been many documented cases of it since the earlier decades, the cases being more prevalent in teenagers.

Chromhidrosis produces sweat that is blue or blue-grey, which can stick to the back of your upper thighs and get deposited onto the toilet seat whenever you sit down to do your business, thus ultimately staining it. This illness is recurrent, but sweat pigmentation reduces with time.

This is one of the most common causes of your toilet seat turning blue, so we advise you get a medical checkup to find out if you have this condition. There’s no reason to be distressed, the condition is very rare and harmless, as it has no side effects other than colored sweat.

Spike in Hormones

Another common reason for your toilet seat turning blue could be because of the spike in hormones which is usually reported when a person is pregnant. Although some people may have a naturally high production of hormones in their body, which could be the potential cause.

The increased pH is due to the increased production of hormones in the body, which interacts with the antimicrobial layer of ionized particles on your toilet seat, indefinitely turning your toilet seat blue. Again, the causes of this could be medical, so it’s best to get a checkup. This way, you could find out the actual cause of your spike in hormones and regulate it accordingly.

Blue Dye from Clothing

While the above two seem like the most common reasons, this one is perhaps the most possible reason; blue clothing dye. If you wear blue jeans or trousers most often, there’s a chance that they may contain blue dye, and this dye can leave a color residue on your toilet seat when coming into contact with your thighs.

The repeated interaction of your toilet seat with the clothing dye stains it little by little over time, until you start noticing the blue color. This is especially prevalent if the blue clothing you wear stays wet often, due to sweat or being recently washed. Not to worry though, the dye isn’t permanent and would go away if you clean your toilet seat thoroughly after each use.


One last reason for your toilet seat’s blue stain could be the interaction of bacteria with the cleaning detergents, which can leave blue streaking on the toilet seat. This is one of the least possible reasons why your seat is turning blue, although the possibility is still there.

The theory is that the bacteria present on your body and on the toilet seat might interact with the sweat, dirt, and cleaners around, producing a blue color enough to stain the toilet seat. Bacteria growth and interactions are unpredictable, and although this is a viable reason, we recommend that you consider the aforementioned reasons first before considering this.

How to Remove the Blue Color From Your Toilet Seat?

Now that you have the answer to the question ‘Why is my toilet seat turning blue’ it’s time that we discuss how to reverse the staining. The blue stains on your toilet seat can be a stubborn hassle to take care of, however, it’s not impossible to get rid of the stains altogether. These are a few remedies you could use:

Baking Soda and Vinegar

Baking soda and vinegar solution is a perfect home remedy to get rid of your blue toilet seat stains. Just prepare the mixture in a container and pour it over the toilet seat. Use a brush to thoroughly scrub, and rinse the toilet seat after.

This is by far the best way to remove blue stains from your toilet seat, as it won’t leave any marks. Other cleaning products, especially bleach, may cause unwanted stains on your toilet seat.

Magic Eraser

If the stains are extra stubborn, use a magic eraser to get rid of them. Simply wet the eraser and scrub the seat until you see the color slowly disappear. Scrub thoroughly to get rid of all the color and rinse the toilet seat with water at the end.

Rubbing Alcohol

Rubbing alcohol is a great solution for removing the color from surfaces, thus it can be used to remove the blue coloring from your toilet seat. Just use a cloth and dip it in rubbing alcohol to wipe the stains from the seat, then leave the cloth there for 20 minutes so it can absorb all the color.


A staple for toilet cleaning, bleach can remove all sorts of stains from any surface possible, and is considered a heavy-duty cleaner. Mix bleach and water in equal proportions, and pour the solution onto your toilet seat to leave for a few minutes. Make sure to cover all other surfaces, as bleach can damage them.

Keep in mind, however, that bleach may cause unwanted stains on plastic toilet seats. Only use this, or other products containing bleach if you have tried the above-mentioned methods to no avail.


If all the remedies don’t work, chances are that your toilet seat is unsalvageable and would need to be replaced as soon as possible. Now that you know all the underlying causes as to why your toilet seat might be staining blue, try all the remedies to get rid of the color before your resort to changing your toilet seat.