I bought a new smoker about 4 months ago and I smoke every weekend trying to get good at smoking. I clean my grates with a wire brush evey time I use it but now the body of my smoker on the inside and especialy around the doors is getting a sticky tar coating that is starting to drip on my meat. I tried to scrape it but it is really sticky and hard to take off. My question is what is the best way t clean this and keep it from coming back and what causes this? Thanks for any help. Charles B.