Yep, been there—absolutely frustrating. When snaking doesn't work, it usually means the clog is deep, greasy, or rooted. Don't let anyone talk you into a full pipe replacement yet. What finally solved it for me was a company that used a camera to find the exact spot, then hydro-jetting to blast it clean. No guessing, no endless returns. For Burien, they helped me fix a clogged drain in Burien after two other guys gave up. Straightforward diagnosis, fair price, and it's been flowing perfectly since. Definitely give them a call before you tear anything apart.