How can I unstick these toilet hinges?

Rowena Dennis
by Rowena Dennis

I need to replace our toilet seats, but can’t remove them as the metal hinges are in 2 parts that slot into each other and have become ‘welded’ together (pee?) so I can’t get to the screw underneath them. Toilets are wall faced so no access behind. Have tried hot water, vinegar, WD40 and drain cleaner!

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