| As everyone says, brake cleaner from Halfords, clean cloth and that'll be job done on the discs. I've done it before brake fliud and WD40 and it really depends on how much the it has penetrated the pad and how long it's been in contact, but without seeing them, I'd guess a good spay with cleaner and gentle rud with some wet'n'dry paper until they're clean and dry and the pads will be fine, just take it easy when testing it out.
WeeJohnyB | 
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