[eagle697]

I would NOT preasure wash mine. Every now and then, if i have had a messy cook, I will open the vents up a little, and let the temp get up to around 300 or so for a while, this ussually ashes any drippings up enough to brish out the inside with a stiff bristled brush i use to clean out the inside.

Be careful doing a burnout. If you have a clay one, letting the temp get too high can cause it to crack. I have even had this happen with the firebox on one of my ceramic cookers.

As far as getting a kiln to fire it, I think a kiln would get to hot for the clay style of the old kamados. I may be wrong, just a guess.