Upper Washbowl Cliff 

Descent Note: The Partition rappel is "problematic". Rappelling from the top of Partition with a single 60m rope gets you to the 3rd-class ramp but most likely will not make it to the fixed anchor (a cedar) above Mastercharge. A single 60m rope will not make it to the ground from here. There is a smaller cedar about half-way down with an awful stance that has a fixed anchor, though it has a continuously changing supply of leaver biners that are cleaned and then replaced (two ropes will get you to the ground).
The ledge the large cedar is on has a couple slots where the ropes can become jammed, so care needs to be taken to avoid this. You can wedge a stick in there to prevent the rope from running in the slots or ensure you run the ropes over the lip, and not in the slots.

Regarding the descent -- the rappel on the right end of the cliff is really easy -- one rap with a 60m rope returns you to the base. Easy pull too. For some reason, this hasn't caught on. This also avoids rappelling over all the crowds on the Wiessner Route and neighboring routes.

When rappelling from the large cedar on the 3rd class ledge, you can use a stick in the crack as a back-up but it is pretty easy to keep the ropes on the lip as you rappel. If you use the "stick in the crack" method, be sure to bring one from the ground. Don't break one off of the tree. Also, I didn't think the walk-off was all that bad. Yeah, it's loose in a few sections but it's pretty quick and hassle-free.