Hey guys/gals, I have a Master Forge gas smoker that I have used a lot. It's starting to drip black stuff on my food when cooking. I know what it is, but how do you clean it off. When it cools it's hard like tar. I am getting to the point where I want quit using it. The stuff has built up on the upside of my smoker so much, I don't know how to get it off.