I just purchased a new custom built commercial size smoker. The smoker is awesome (pics to follow). The only problem I have is that there is oil or tar in the smoker/ oven. I asked the builder and he said this is normal as they come from a pipe yard. He said I can just burn the stuff off and I will be safe. I just want to hear from you guys that this is an ok method, or is there a solvent i should use??? Please help! Thanks!