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3. Wet towels: They can block the drainage system. And as a result, you will have to clean the pipes every 3 months.4. Baby diapers: The gel inside the diaper cannot be dissolved. Even when exposed to water, they swell and cause blockage in drainage pipes. 5. Cotton swabs: They often stick together in the kinked tubes and can trap other trash such as hair and cause blockages.6. Oil and lubricants: You should not pour leftover cooking oil down the sink because after it cools, it will form pieces and blocks that can clog water pipes.