If you're not they buy some high flashpoint solvent such as contact cleaner sold by Maplin and clean them off with that and a paper towel. Then rub the friction material over a bit of sandpaper or wet and dry.
I'd be inclined to say that the pads will be goosed. GT-85 or any light oil will not do your pads any good whatsoever.
You could try soaking them in some Isopropyl Alcohol to remove as much of the oil as possible and then evaporating the rest and drying them out in the oven.
Or you could just get some new ones.
be worth getting new pads based on age . i took the pads out of an old c2 caliper i have and while cleaning the back with a scourer managed to pop the braking material off . it was a few mill thick too
I was only trying to clean the back of the pads,some probably got onto the pad itself but i wouldnt think much.
i did phone a biker pal on this and he says his discs pick up road film and can seem quite greasy.
He washes them in boiling water,said mine will be fine if i do the same.