Wanted to thank mohawkx for posting the cleaning method.
I used this method on my ECHO E and it worked perfectly.
Wanted to add that my dry burn took about 50 hits (resting several times to let the carto cool down).
The first 10-15 hits to dry out the water from rinsing the carto and the rest to burn the coil. You can't see the coil until the junk is burned off...just keep burning until no more nasty smoke and smell. Then be sure to rinse all the ash out of the carto (I pour boiling water
through the carto)
The filler material went in easy. I used the straw provided by Billb.
I fired up the echo right away and had slight burning taste for an hour or so (even with the filler pushed down slightly). I will let it sit over night next time.