What Cause Plastic toilet seat Yellowing?

The yellow stains on the toilet seats are embarrassing and unpleasant. To avoid these stains, you need to take proper care of your toilet. In our topic of discussion, we will discuss the factors causing plastic toilet seat yellowing and methods for removing these stains.

Plastic toilet seat yellowing

yellow stains on a toilet seat

Before buying a new toilet, considering cleaning it yourself. Our proven methods will help you in removing the yellow stains.

What causes yellow stains on a toilet seat?

The presence of Yellow stains is a common problem, you might regularly clean the toilet seat, but yellow stains can come for many reasons, some of the causes are:


It is the most common reason for yellow stains on the toilet seat. No matter how frequently you clean the toilet seat, the seat color changes over time. It may turn brown or light yellow. The stains can spread below the rim and on the bottom of the bowl.

Hard water

Hard water is another reason that causes yellow stains. The stains caused by hard water are sometimes stubborn and are impossible to remove. The hard water contains iron, magnesium, and calcium, these minerals stick to the surface and create yellowish stains.

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Sunlight has the tendency to change the color of your toilet seat. When the seat gets exposed to UV light, bromine molecules get destabilize, causing the plastic seat to turn yellow and even brown if left for a longer time. You may feel the seat is dirty, but the sunlight caused the color change. However, these stains are not permanent and with little effort, you can easily wipe those stains.

Unclean urine

Unclean pee is another common cause of yellow stains on the toilet seat. Urine stains are the most embarrassing and unhygienic thing. If the toilet is not cleaned properly, within a few days, a pale stain starts appearing and the seat becomes horribly smelly.

These are some of the most common causes of yellow spots on the toilet seats. With little effort and by following our simple DIY methods, you can get rid of yellow stains.



Vinegar is a common household ingredient and an effective cleaning agent, it works great to remove yellow stains. Take a cup of vinegar and apply directly into the affected area and leave it for at least an hour. Now scrub the stains with a bathroom cleaning brush.

Another way is pouring the vinegar into a spray bottle and spray on the dirty area. If possible leave it overnight. Use the brush or a cloth to wipe the seat.

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Baking Soda


Just like vinegar baking soda is another powerful disinfectant. For certain results take one-quarter of baking soda and add 50 ml of warm water. Now smear the solution on the seat and wait for 30 minutes. Use a toilet brush and scrub the stains, washout with water, and wipe with a smooth piece of cloth, you can repeat the process if needed.

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Use of coke

Your favorite cold drink Coke can help you to get rid of yellow stains. Your favorite Soft drinks contain phosphoric acids. Take a 1.5-liter bottle of Coal into a bucket, soak a small piece of cloth into a bucket. Place the towel on the toilet seat and sit for 20 to 40 minutes. The night is the best time for the practice. The carbonic acid softens the yellow stains, so when you scrub with a toilet brush, the stains come out easily.

Use of Bleach

Bleach is the most commonly used chemical for removing stains. While using this method, you need to use a pair of gloves. Take a bucket filled with one-third of bleach and water, stir to make a solution. Remove the toilet seat and dip into the solution, use a scrub brush to scrub the stains away. The night is the appropriate time for this technique, the seat will remain soaked for a longer time. If still some stains exist, simply repeat the procedure for better results.

Valuable tips (Infographic):

What Cause Plastic toilet seat Yellowing

Final Thoughts

The urine stains not only lead to yellow stains on the toilet seat but also cause odor spreading. You can prevent non-hygiene things with regular cleaning of the bathroom. We hope you find these methods helpful and you got the answer to how to remove urine stains from a toilet seat. Moreover, you learn what causes plastic seat yellowing.

Must Read: Best Toto Toilet

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