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Yeah, I've had results with those mechanical things too.
Howard-
Last week I managed to sort a blocked toilet in a loft space. Something was stopping the waste falling over the edge into the soil pipe.
Managed to create some pressure by sucking water from the bowl and plunging it back in. Was enough to tip whatever was stuck on the edge. Like an arcade penny pusher 🤪
Airhead
As long as it does the job. If it stays in the pipes it's awful. It's also possible to get heat build up with the stronger chemicals as they react with water producing heat. That can be enough to cause a problem with plastic fittings.
Just a word of warning about the strong stuff. I do have a bottle of one shot but it's lasted 15 years so far.
Something like this a great starting point for any unblocking. You can suck and blow with it making it way more versatile than a plunger. Also useful if you are dealing with pipes full of acid!!
[https://www.amazon.co.uk/Drain-Unblocker-Powerful-Blockages-Chemicals/dp/B08H5LZPBG?
Try boiling water before you try chemicals, sometimes it's a build up of soap which can be broken down by a combination of simple methods. Worth trying to get access to the trap though as mechanical removal is by far the best method.