Some of the links on this forum allow SMF, at no cost to you, to earn a small commission when you click through and make a purchase. Let me know if you have any questions about this.
I take the racks off and throw them on my grill on high for 10-15 minutes. The walls, never touched them. I do turn the heat to 275* for an hour or so to "kinda" clean it out. The water pan and drip pan I cover with foil so after the smoke, I just throw it away.
I'm sure smarter people will give you some more and better ways to clean it.