THRIFT T-600 Alkaline Based 6 lb. Granular Drain Cleaner, White (Pack of 4)

I have used this drain cleaner for 40 years. an old plumber told me about it. It has never failed. I moved into a house one time. i ran water into the bathroom sink. plugged up. figured it would drain on its own. several hours later it was still full. I poured Thrift into it and in less than 30 seconds the clog was draining. The sink had cool/cold water in it; thought it might not work. It did. Typical instructions are run hot water through the lines, pour in 1/2 to 1 cup Thrift. run hot water to help melt crystals. let it set for 1 minute, then run more hot water. Amount used depends on if using for maintenance or to unplug clog. Product is white crystals.

Obviously you can have a blocked sink that requires Roto Rooter but for most clogs this stuff is incredible. I learned about it from the plumber who came to unclog our bathroom sinks and that's all he did for 100 bucks. Give it a try.