Drain unclogger

I was dealing with a stubborn shower drain. Backed up and it smelled bad. Liquid Plumr had no effect. A hose and plumber's bladder made the water drain slowly, but it clogged right back up again. I bought a jar of Green Gobbler Ultimate Main Drain Opener and poured half into the drain and let it sit overnight. The next morning I poured in a quart of boiling water. Problem solved, and the bad smell is gone.