Pulling the radiator this morning and I can't for the life of me release the fan switches, i'm letting them soak in some contact cleaner, is there a nack to this ?

i have mounted a second fan switch with relay .
i use the a/c fan for to cool the water radiator when i want

It's a push connector not a release tab type ! Result it's off I just can't see any obvious signs of damage, the leak appeared to come from the plastic shroud on the side