it seems like on Sunday no matter what I did I could not get a nice propane blue flame from the burner. Nothing but orange that left a lot of carbon on the bottom of the pots. If I played with the air damper (i'm sure that is not the right term for it, but you know what I mean) and all that did was make the burner louder and worse so I found the quiet setting and it was still very orange. I was thinking it was dirt or spider webs or something but they just would not clean up. any suggestions?