Up in the lakes yesterday, as we set off from the car, while oiling his chain my mate accidentally got oil on his disks (didn't know it) and soon pads and disk were contaminated.
So whipped the pads out and the disk off the wheel and "washed" them both in mud and grit. Making sure they were well roughed up. washed them off in a stream.
Hey presto back to full working ordr.
Seemed common sense to me, but he was really impressed.
What other tips have you got?