Drains should be cleaned regularly to prevent buildup and potential clogs. For kitchen sinks, it's advisable to wash them every few months to remove grease, food particles, and soap scum. Bathroom drains should also be cleaned regularly to clear hair, soap residue, and mineral deposits. Homes with large families or older plumbing may benefit from more frequent cleaning, perhaps every 1-2 months, to maintain optimal drainage and prevent blockages. For more information, visit Guardian Plumbing.