Although Instant Power Main Line Cleaner is not to be used in toilets, it really does help to unclog your main sewer drain lines. I've used both it and the Instant Power Hair and Grease formula for some time and both products have saved me a FORTUNE in plumber bills!!! The Instant Power Hair and Grease formula works GREAT in both washing machine drains and kitchen sink drains. You put it in, let it sit over night then run a lot of HOT WATER down the drains.

Both Instant Power products are miracles and life savers!

https://www.homedepot.com/p/Instant-Power-128-oz-Main-Line-Cleaner-1801/100126446