If you have any greasy/oily junk on the brake rotor; use high concentration rubbing alcohol or brake cleaner to clean the rotor surface, then take the pads out and just barely sand the surface off with sand paper. It will get rid of all material that has any oil on/in it. You will have to basically bed the pad again though, so no crazy braking for a bit, just firm gradual stuff to get the pad happy.
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