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It's something you've likely done countless times, but water companies are now warning that pouring milk down the sink is a mistake.
We've all been there: you're making a cup of tea or preparing breakfast, reach for the milk bottle, and are hit with that unmistakable sour smell, signalling it's time to dispose of the lot.
That's if you're fortunate enough to notice before taking your first sip of tea and discovering it's curdled and lumpy.
However, according to Scottish Water, households must never pour off milk down the sink, as it creates issues for both your home's drainage system and the wider environment.
Scottish Water warns: "Pouring milk down the sink is a big no-no. The fats and proteins in milk can solidify and stick to the walls of your pipes, leading to blockages. These blockages can cause your drains to back up, resulting in unpleasant smells and potentially expensive plumbing repairs. Moreover, when milk enters the sewage system, it can deplete oxygen levels in the water, harming aquatic life.", reports the Express.
Rather than using the sink, Scottish Water is encouraging households to dispose of old milk in the garden, either through composting or diluting it with water before pouring it onto plants.
Alternatively, simply throw it in the bin.
The company adds: "If you have a compost bin, you can add small amounts of old milk to it. Milk is biodegradable and can provide valuable nutrients to your compost. Just be sure to mix it well with other compost materials to avoid any unpleasant smells.
"Diluted milk can be used as a natural fertiliser for your garden. Mix one part milk with four parts water and pour it around the base of your plants. The nutrients in the milk can help your plants grow strong and healthy.
"If composting or using it in the garden isn't an option, you can dispose of old milk with your regular household waste. Pour the milk into a sealable container, such as an old milk carton or a plastic bottle, and place it in the bin. This method prevents the milk from leaking and causing a mess."
Scottish Water then issued a warning to households: "Do not pour it down the sink: As mentioned earlier, this can cause blockages and harm the environment. Do not flush it down the toilet: This can also lead to plumbing issues and is not an environmentally friendly option.
"By following these simple tips, you can dispose of old milk in a way that's safe for your home and the environment. At Scottish Water, we're committed to protecting our waterways and ensuring that you have the information you need to make responsible choices. Remember, every little bit helps when it comes to protecting nature."