It helps to know what usually causes sinks to block, as prevention is always better than cure! In kitchens, the main culprits are often fats, oils, and greases (FOG) poured down the drain, along with food scraps. Over time, these cool and solidify, clinging to pipe walls and narrowing the passage. In bathrooms, hair, soap scum, toothpaste, and even small jewellery items are frequent offenders. While you can't always avoid every blockage, understanding these common causes can help you be more mindful about what goes down your drains.