I hit the defrost button while taking the jag out of storage... well mouse dropping came out or the defroster vents. impressive amount of airflow and stink! but not exactly what I wanted. has anyone here gone into the bowles of the dash to take apart the heater core and associated duct work area apart for cleaning?? if so how much of a pain is it, and what was the chiropractor bill afterwords to put your aching back back together again? John (not as agile as i used to be)