John J presented the following explanation :
On Saturday, 30 January 2021 at 16:15:06 UTC, Heaven wrote:
Hello all. Please can someone help. My brand new toilet somehow got blocked.
So, I poured a cap full of caustic soda down it and some boiling water.
Nothing happened. So I kept doing it, so much so that the crystals have
totally hardened and now, the hole has almost totally blocked up and none of
the waste is being flushed away. How can I dissolve the totally rock hard
caustic soda. Can I salvage my toilet?? Can it be cleared away. (Almost 10
days now). Thank you for your help.

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Have you tried a good, strong laxative?