Hello, We are new to camping and purchased a 2002 Viking Saga pop up which has the Suburban NT-16SE furnace. We have only used it once, more less to test it out. Of course, we get it out for the first time this year and we find that mice built a nest in the furnace, visible from the exterior exhaust vents. I removed the vent cover and used a flexible tool to grab a lot of the nest, along with compressed air and a shop vac, both from the exhaust port and from the igniter/burner area. I believe they took up residence in the Combustion chamber. When I turned the furnace on it blew smoke for about 30 seconds before stopping and now the exterior exhaust smells like urine. The heat blown inside the camper only smells like urine for a couple of minutes and then it seems to go away. We ran the furnace for two, 30 minute sessions on the highest heat setting to try and burn anything remaining. Is there anything else I can do to clean the combustion chamber? The diagrams I have seen make it seem like it's very difficult to remove and the item cost half of what the whole furnace does. Any suggestions or help is greatly appreciated!