Drain clogs are often caused by a buildup of old grease or objects getting caught in them. In Seattle, I use the service
https://bens.plumbing/services/drain-cleaning-seattle/ to solve these issues. I'm completely satisfied with this service. I've used their services several times, and their technicians are always sober and polite. They have modern tools, and their diagnostics are accurate. They clean the pipes thoroughly and provide a warranty after the job is done.