On Thu, 24 May 2012 12:54:18 -0700, so wrote:
Work from top to bottom and spray between the
pleats as much as you can. You're not going to get everything off.

The interesting thing is that the hose DOES seem to get all the green
pasty goop off once I hose it down. The problem is that the pleats are so
tightly packed that the hose can't get to the inside of the pleats until/
unless I manually open them up.

If there was a better mechanical way to OPEN the cleats to expose them to
the hose, they'd certainly clean off nicely.