Insects are attracted to LP gas smell. So, many times at least one bug is
found ,with his head stuffed into the burner,dead.This is bug heaven.That
other stuff looks like rusted vent.I think the white stuff is alunminum
oxide.That vent is unpainted on the inside and will rust 365 days a
year.Maybe POR15 manifold grey will coat t his pipe on theinside.Good to
1400degrees F. Earlier rm182a refrigerators seem to have a different metal
alloy in the vent.It doesent rust much.