You could use this. You can pick it up at autozone.
-Eliminates odors caused by bacteria, mold and mildew in A/C systems
-Special formulation and direct extension tube applicator allows treatment at its source - vents, ductwork, evaporator core and drain pan area
-Safe for all A/C systems
-Biodegradable, long lasting formula
-8 oz. size
It worked well.
Does not leave a strong chemical smell after use.
Part number OE-1. cost about $11.
Gibson Exhaust, AFE Stage 2 Intake, Diablosport programmer, FlyinRyan trans tune & PCM tune, Brush Guard, Tail light Guards, HID Lows & Fogs, LED interior lights, SRB 100w Fog lights, Plasti-dipped wheels, 245/70/17 General Grabber AT2's, and Vent Visor Rain Guards