Oops! I must have missed that "Clean after every use" part!
I clean the water pan "Before" every use. (Usually the pan is too hot right after use and the operator is too tired)
I clean the grills with fire and a wire brush before each use for the same reason as above. I am of the blackened grill school, not the shiney grill school
I will clean out any ash and rinse off or replace the lave rocks as needed.
I hose out the cobwebs if I notice any, otherwise it is purification by fire!
Somewhere there is a method for cleaning out birds nest from a smoker I recall