Duo Unblocker Extremely Powerful by HG

I've used this on my house, my mother's, and my neighbours. It absolutely does what it says on the box. Follow the directions for use, and it'll do the job.

Excellent. I had a persistent problem with the bathroom sink and everything I tried only seemed to partially clear it. It would be better but still draining slowly and then start backing up again after a couple of days. Put one treatment of this down before going to bed and the next morning everything was completely cleared. Would recommend.

Effective for clearing shower drain blockages. May need to use twice though. Good value

Worked in 10 mins. By adding 2 parts of A and 2 parts of B. Would buy again.

Bought as it had a money back garentee . I pre cleaned the S pipe before purchase and I couldn't get everything out from the outlet pipe that connects to the path for drainage. It stunk and it was vile. I didn't pour the first dose down the plug hole.. as that was not blocked. I did it down the issue pipe. Thinking about gravity and how it would not be able to work without pressure that is not mentioned in the instructions Left for 6 hours. Initially it looked to have worked but then the sink backed up again. So the second dose went down the plug. I measured on ml how much water would need to be added for it to reach the down pipe blockage. So it wasn't sat where it wasn't needed. Left it for 3 hour's. Drained it and its now free from blockage

I went for a powerful cleaner because a wanted a permanent solution. This worked immediately and many months on the problem has not reoccurred. Very pleased and will use again.

Doesn’t work!

This works so well. Does what it claims to. I was so pleased because I’m usually dubious with things that have such bold claims!