Hope Shit shifter on avid pads is shite. Just take yours pads out, and you rotor off, and whack em in boling hot water for a few minutes. The scrub them with a jiffy pad. Whack it back together, and you'll have to play bedding your brake in again. To do this, drag it along, until it gets really hot, and you legs start to hurt, then poor some water over it, and carry on doing this for a while.