Yes oil and grease will soak into the pads, you can try rubbing them down a bit and giving them a good squirt with some brake cleaner, but I doubt it will make much difference. If it were me I would be replacing them!
As for the discs, whip them off again and check they are sitting completely flat on the hub. If they are and it does turn out that they are warped, a machine shop should be able to resurface them if there is enough meat left on them.
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