If you'd like to dive deeper into a specific method, let me know: What do you have? Are you dealing with standing water right now? Do you have plastic (PVC) or metal pipes?
Mineral scaling can narrow the diameter of your pipes, making it easier for debris to get stuck.
For about $5 at any hardware store, you can buy a drain snake (often called a Zip-It). Insert it into the drain, push it down until it stops, and pull it back up. The barbs will pull out hair clumps you didn't even know were there.
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