I've done the same as japhroaig. I have since bought a couple washable nylon bags, one for hops and one for specialty grains (before I started doing All Grain). My hop bag contains 99% of the material, and it's long enough that I just lay the end of the bag over the edge of my pot and clamp it with a metal clamp. If I have a recipe with multiple additions, I just unclamp, open the bag, drop in the additions, and reclamp.
It also fills up with a ton of wort, so while I'm immersion chilling, I'll raise the bag out of the wort and clamp, to let it drain. Clean up is a simple wash out - flip inside out to wash the inside, and then hang it to dry.