Turn the heat up... burn it out... brush off the remaining cooked stuff... I do that to my MES 30... 2 hours at 275.. it's all gone....
I store my MES 30 in the laundry/mud room. Critters out in the country get after cooking stuff left out on the porch. I usually leave it open a couple of days after a smoke since I wash all the pans, grills, etc. Now I'll just leave it cracked and all will be fine. Thanks for the tip guys.