I know I need to keep the disks clean on my bike, but if I've got them covered in grease, what should I clean them with?
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the pads are likely trash, but you can use isopropyl alcohol to clean the disk rotors (say, to remove grease BEFORE it gets into the pads).
I've heard that boiling the disk brake pads in water can help remove the oil from them if they've become contaminated. It wouldn't be the first thing I'd try, but if you're trying to restore an otherwise trashed pair of pads, it might be worth a go.