Muffler ? Who said anything about I muffler ? I was just reading a good book entitled "Brown Spots on the Ceiling" by Hu Flung Poo. Excellent reading if you get a chance

I'm pretty sure that they are from the exhaust but on the bright side, it comes off relatively easily.

No, I don't have a camera but am looking to purchase one for situations like this and many others. Please see "... Camcorder vs. Camera" post and help me out.