Instant Power 1969 Hair and Grease Drain Opener, 1 l, Liquid, 2 Pack

Have been buying this stuff for years and it is the only thing that actually clears my drains fully. So easy to use, I have found it works best if you use about 1/3 bottle and let sit overnight and then flush in the morning by running the shower very hot for several minutes. I have long hair and multiple dogs with thick coats and this clears the hair from my drain with no issue. No strong odor. Two bottles usually lasts me over a year. Will buy this a million more times.

Works great and good price. Doesn't have a strong smell like a lot of drain cleaners

This is a very effective sink and shower drain cleaner. We have found it most effective following directions to pour it, let it stand overnight, then flush with hot water. Difference is very noticeable.

Absolutely does the job. And faster than similar products.

I bought this and it worked great on the bathroom sink last year. Now the bathtub very slow draining and since it is so old, the drain can't be removed. I used "Green Gobbler" a week ago. There was some improvement but still draining slow, so I thought that I would give this another try, but there is a warning on the bottle about using this if you have used another product to clear the drain. It doesn't indicate if it was the same day, or at any time. Not sure if I need to wait another month or two or not use it at all.