[Dave W]

Without a 'sample' of the odor, no clue what you have. In our case it was mice droppings and possibly a dead one in the belly at the rear, Additionally, if these nasty critters got into the furnace ducting, you will have a nasty odor as soon as the furnace fan starts, My fix was to drop a portion of the belly cover and sweep/blow it out with compressed air then Febreze as much as possible.


We haven't had mud dobbers - yet - but have had wasps in the a/c shroud, a bird's nest in the king pin box and a past RV, chipmunks down the fridge vent which was expensive to repair,


Screens wherever possible - dobbers and some spiders seem to love the mercaptan odorant added to propane