Believe it or not my granddaughter urinated into the heating vents in her home. The home is only 4 years old. She did this in three different rooms in the house. The smell is only strong in one of the vents. Want to know best way to get rid of the smell?? It is a gas forced air unit. Thank you S Standley

Spray fabreeze down the duct with the urine with the furnace off. You can also spray it in the cold air return with the blower on and let it circulate. It will take some time to disapate.