Mr Muscle Biodegradable Drain Unclogger & Cleaner, Biodegradable Formula to Clear Slow Drains, Safe on All Pipes, 750ml

Reviewed Feb 2025: Have had a few instances where the toilet was blocked due to huge logs, and even after 8 hours of bleach, could not move the moser.. After several flushes to make sure the bleach was gone, and no risk of mixing chemicals, I tried this almost in desperation. After a few hours, it had started to breakdown the contents, and after a flush, the whole lot moved and the toilet was back operational again. Much better, and cleaner than a plunger or using the wifes toothbrush to poke it free. Will by again.

I’ve been relying on Mr Muscle for years to tackle my shower drain which seems to clog pretty often. No other brand works as well in my opinion. I was happy to receive this biodegradable version of the one i usually use to try. Using it is the same as any other drain cleaner - simply pour it down the drain and wait. I will say that it doesn’t work quite as quickly as the standard version. I can’t see it working on the toughest clogs as well either. However, if you’re happy to leave overnight then you’ll get better results. If using products that are better for the environment it’s important to you, you may be happy to take that slight reduction in performance. However, you should be prepared to pay more for it too. If this version was equal in price to the standard version, I would consider purchasing in future.

This is not as efective as the normal mr my me drain unblocker. Had to use two dosages and still not great. This was not a full blockage

One thing you must do is to leave it overnight! I was surprised that it was quite thin, and not a gel type product like the usual drain unblocker. It did seem to have cleared the bath drain somewhat Would buy again

I wanted to try this as a biodegradable option. Wanted to clear pipe going from the bath. Didn't seem to remove the blockage. Directions talk about putting water into the pipe then adding the sink unblocker and ideally leaving overnight. Did this but the smell was back within 24hrs so presumably blockage not cleared. Have used the regular sync on blocker in previous years it's been a lot more effective.