Liquid Lightning Buffered Sulfuric Acid Drain Cleaner, 32 Oz

I have had to use this one some drains in the house. If you are using it be very careful, wear the right safety gear and don't make this your first step on a drain. If the drain is fully plugged do not use this because you will have a dangerous mess. If you call a plumber, he will not want to touch it. I have used this on slow drains that I have already tried to clean out with a snake. I tend to use this to finish what the snake started for cleaning out the drain. The best piece of advice is from my father, if you don't know what you are doing for sure, get a professional and learn for next time. Beyond that, this is a great product for its proper use, and I have used it to clean up drains and return them to like new performance. If you know that you need it, it is one of the best I have ever used.

This product really worked and worked well. I would definitely recommend to is this product on stubborn clogs.

Followed directions exactly. Didn't work at all

This stuff works SO well!! But definitely— be ready — keep a folded towel over your nose and mouth, have the bathroom fan on, and be ready to exit and CLOSE the door behind you. It works very quickly but still — take all precautions.

I had a rust problem in a drain and it didn’t help.

This stuff work as advertised! Stunk up my house like rotten eggs for awhile but cleared my shower drain where the other brands did not.

I used this on a toilet in the house we just bought. It was old and had a built up limestone. I followed instructions and it cleared it like you would see in some fake commercials. It turned it new!I am a chemist so I knew a strong acid would clear that. I googled sulfuric acid and it led me to this product.

In-clogged my kitchen sink. Worked very well!