I've found that the simplest and easiest way to clean racks and water pan - anything removable - is with oven cleaner. It works a treat. I wipe things down and get rid of the easy crud then spray down racks and pans - OUTSIDE - and let 'em sit for several hours. They wash up with almost no effort. Let me hasten to add that I DO NOT use oven cleaner in the smoker (at least, I haven't yet). The only thing I've done is to wash the door glass inside. I've found that Dawn and warm water will get that done weeks after the last use.
I found that the casters on the unit as delivered weren't very user friendly. I bought a cheap Harbor Freight furniture dolly and use that instead of the casters. It works much better and cost about $20. The dolly's wheels don't have brakes but I find I don't need them. The weight of the smoker keeps everything wherever I put it. The dolly makes it very easy to roll it around the patio and place it where I want it.
Hope someone finds this useful.
If you've got tips of your own, please add them to this thread or start one of your own.