Update - after using half a tin of WD40, 2 pairs of pliers which didnt do anything, I've moved onto silicone remove, just appied and need to wait 3 hours; will post an update later.
Silicone remover is for small amounts , you need to remove by hand , rough scourer should do it in seconds.Pliers are of no use, they crush, you need a tool of the right size.
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