>>How much space do you need to get them to bend round a pipe?
Its not that you need space, its that they tend to dig themselves against the opposite side of the bend (i.e. going straight on and wedging).
I've never done very well getting them past a right angled bend if I haven't been able to get to that bend at least with finger tips.
The blockage will be at a place that [obviously] encourages blockages - so a change in width, a corner, perhaps a join between two pipes.
One thing you can do, depending on the age and construction of your pipes, and which pipe it is - you can angle grind an inspection hole the other side of the right hand bend, ram the pipes through there, and then after put a rubber collar over which does up a bit like jubilee clips, to seal the hole again.
With the advantage that you for ever have an inspection hole should you need it.
The other thing you can do is go to the point where the drain comes out. Put a hose pipe as far up as you can get it. Then pack it out with cloth, foam, whatever to seal the exit as best you can, then turn the hose on to blow stuff back up - if you pack it properly you can get a reasonable pressure up there.
Mind you, that can let go a bit suddenly, so cover the toilet, sink, whatever with a towel first.
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