I’ve been noticing that one of our bathroom drains is getting slow again, even after basic cleaning. I usually avoid chemical drain cleaners because I’ve heard they can be rough on older pipes, but I’m not sure when it’s time to call someone. For homeowners with older properties, how often do you usually schedule professional drain cleaning services? Is it something people do only when there is a blockage, or is yearly cleaning a good idea to prevent bigger sewer or plumbing issues later?