Two thoughts here
One- if the bench is inside clean it like you would any piece of wooden furniture.
Two- if it's outside good luck
My brother and I always liked garlic .... Especially good garlic bread!
Fingernail polish remover (acetone), that's what the hospitals use when they get people in that have glued their butts to toilet seats (among other things)
My favourite one is the Banoffee pie, I just love it.
