Well. There normally aren't orifices designed for propane ovens. If you're talking about a LPG oven, perhaps you haven't had your orifices converted over from natural gas to LPG you will need a service technician to do this.
what flamw leaves soot on the apparatus
I think soot and smog come from the air pollution.
the clay chimney liner, or flue as its called maybe cracked, and soot may be seeping out of the crack and into the wall, leaving a stale cold soot smell.
The propane grills flames yellow and cause soot buildup due to a excessive dirtying of the vents.
I would try a stiff metal bristle brush and possibly some type of solvent. Try Easy Off Oven Cleaner. Use it like you would in the oven.
Aeroclenz 1 is a product for use in your clothes dryer that is forumlated to remove smoke and soot odors. You can also try presoaking your clothes and then laundering them in the hottest water, repeated times. A dry cleaner can use ozone treatment to remove smoke odor from clothes. One woman swore by oven cleaner sprayed on soot stains.
Soot is oily ash. (The oil id from the burned wax.) Use the product Goo Gone on it, and it should come clean.
Soot's plural is soot.
Soot is often produced when burning wood.
Charcoal grills produce hydrocarbons as well as soot particles. Also grilling meat can produce toxic compounds. Propane burns cleaner and safer than charcoal.
You still have some soot on the very tip of your nose.
soot doors is provide to clean the outside of the water tubes and to remove the soot.