My friend just got a new smoker and gave me his old 30" Masterbuilt electric smoker. I cleaned the drip tray, racks, etc. but my question revolves around cleaning the inside of the smoker. He had not used it in almost a year and it was really gross and I did a pretty thorough cleaning job but should I scrape the inside of the smoker to get the black off the walls or leave it as is? Also any general advice about cleaning the smoker that hasn't been used in a year would be awesome. Thanks a lot guys!