I have a musty, "mousy" smell when I turn on my heater or AC (1965 C20). I think that when my truck was in a barn for two years waiting for me to buy it some mice got into the heater hoses and did their thing. I am wondering how I can remedy this. I have heard that I can spray an antibacterial spray (like Fantastic) into the cowl with the blower going and the spray would get sucked into the hoses. Has anyone had experience with this?