Why the Bottle Smells Even After Washing: If the bottle still smells damp or plastic-like even after washing it daily, then the chemical process taking place in the lid is responsible for it.

How to remove bad smell from water bottle?

How to Remove Smell From Water Bottle: Reusable water bottles used at the gym, office, or while traveling often start to emit a strange odor. Many people attribute this to lack of cleanliness, but the real reason is something else. If a damp or plastic-like smell persists even after washing the bottle daily, a chemical process occurring in the cap is responsible.

Why does this happen?

Experts explain that moisture gets trapped in the threads and tiny grooves of bottle caps. When a bottle is closed before it's completely dry, an environment is created inside where substances slowly break down. This isn't just a matter of dirt, but rather the chemical decomposition of the materials used, which directly impacts water quality.

What did the research reveal?

Most bottles are made of a material called polyethylene, which is strong but not completely safe. According to a study published in Water Research, this material slowly breaks down when exposed to light and water. This process produces chemicals that produce odors and can spoil the taste of water. Even dim light, especially, can accelerate this process, further exacerbating the problem.

lid roll

The cap becomes the most crucial part of this process, as it is where water remains for the longest time. Furthermore, moisture and residual particles also contribute to odors. Research titled Progress on Odor Deterioration of Aquatic Products states that odors are often caused by moisture, fat oxidation, and microbial activity. This explains why bottles may exhibit similar odors.

How can we fix this?

However, this problem isn't difficult to avoid. The most important thing is to avoid closing the bottle immediately after washing it. Experts recommend using a separate drying method, which means keeping the bottle and cap open separately until they are completely dry. This allows for air circulation and removes moisture. Furthermore, avoid placing the bottle in direct sunlight, as light accelerates this chemical process. If the bottle already has a strong odor, it may be beneficial to thoroughly soak and clean it, which removes the odor-causing elements.