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I Thought of Caustic soda. The problem there was the amount of dirty water backed up. It would have needed a couple of kilos to get the concentration high enough.
I have cleared worse blockages. Toilets are much worse particularly when you get the inspection cover off the pipe and someone pulls the chain before you have got out of the way.
Plumbers usually have some good stories. A mate of mine got called out to clear a toilet blockage three times in about two years. The third time he left the blockage on the bathroom floor. He never got called there again.
Baz
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