Hi, new here and I have a problem with mice droppings in my motorhome furnace ducting that has been sitting for a couple years. Its a Holiday Rambler 28' 1994. I can see mice dropping through the vents in the floor so I don't even want to turn the furnace on. I need to clean or flush out the ducting first. Since this is below floor level can it be flushed out with bleach water and allowed to run out into the basement? It has a layer of insulation laying on the bottom of the ducting so I'm wondering if that would dry out if I parked it on an incline and kept the furnace running. Any ideas or solutions would be appreciated. Thanks