Not so concerned about stains, those are badges of honor. I figure once I have complete control of where the air is entering / exiting from, I will be able to control the vents better.
Terry - KCBS member
LSG 24"x30"x36" Vertical Upright Smoker with Warming Oven - *** In queue to be built ***
Weber Smokey Mountain 22.5" - Weber Genesis S-330
Pitmaster IQ-120 - Thermapen - Maverick ET-733
For info on any mods I have done to my WSM, please see this post