I'm only a "Newbie", so admittedly, I have lots to learn. I have an original, non-digital Bradley. After each use, I remove the 4 racks, the deflector thing- a- ma- jig, and the burnt bisquette pan. I then let all of it soak in hot water with dishwashing liquid. After a few hours, I wash, then dry each piece by hand. I've only been at this for a few months, so I don't have any kind of solidified build up in the interior of the unit. The instructions that came with the Bradley, said to "season" the unit with 2 hours worth of smoke, and then to leave the interior alone. I do know that each time I use it, whatever I put in tastes better when it's done. It's like all of the flavoring of the previous smokes combine with whichever flavor I'm using. I do spend alot of time making sure that the exterior stays clean. I've heard horror stories about the gaskets on the Bradley dis-integrating. I clean the gaskets with warm, soapy water after each use, and I use Q-tips to get into all the grooves.On the top of the unit, is the "vent" that needs to move freely. The smoke coming out of that vent, very quickly builds up a very sticky residue, that makes it impossible to adjust the size of the opening. I un-screw it, remove it, then soak and wash that piece also after each use. Perhaps I'm crazy, but my unit looks, and performs as well as it did the first day I got it. I've used it about 25 times, and it still works perfectly. As they say, the key is paying attention to the details, and not overlooking the "Little Things". Thanks for letting me share.