A while back, the buggers gained entry through the steering shaft, now protected with row steel bolt on cover. However, they had a fun time in the hvac ducting, making babies and such. I have had the dash and ducts out 3 x, used frigi fresh in the condenser multiple times, but still have smell of urine coming through vents. Also cleaned under cowl, which was mice free, and vacuumed the bottom heater duct, back seat heater out, etc. What else am I missing? I've searched the forums but could not find the answer. Many thanks!