If you take a whiff of the milk as you’re getting ready to make a morning bowl of cereal and discover that it’s gone sour, don’t head for the sink. Even though it’s a liquid, milk contains fats and proteins that cause major issues once it enters your pipes. The fats in the milk harden and stick to the cold walls of your pipes when they cool down. Milk proteins also create a sticky, glue-like film that traps other debris, food particles, and grease you can’t prevent from going down the sink. Over time, this buildup combines with oils and non-flushable waste to form massive, rock-hard blockages known as fatbergs, which lead to expensive plumbing repairs. Finally, if you have a septic system, pouring milk down the drain introduces heavy organic waste that overloads the natural bacteria, potentially causing system failure. Instead, try diluting the milk with equal parts of tap water and pour it onto your garden soil, where the calcium and nutrients can benefit plant growth.
