3 Pcs Drain Bladder Kit, Drain Cleaning Bladder Fits 1" to 6" Pipes, Rubber Drain Bladder Unclogger for Bathroom Sinks, Showers, Swimming Pool Drains, Kitchen Sinks and Main Drains

I would snake first. Then use one of the drain bladders that will force a clog through sealing off the backflow. I don’t use them first because snaking is the least likely to damage lines. I use chemical stuff as a last resort. Most of the time if they’re that bad it’s time to replace. Drain bladder link below. https://a.co/d/08GLPZMT