Audi line dealer service departments have a spray that "de-funky-fies" the A/C
duct-work. The spray can has a long hollow wand so they can reach deep into
the ducts via the vents and hose them down.
After that, whenever you use the A/C, a few minutes before you park the car
turn off the compressor (ie: press the Economy button), make sure you're
pulling fresh air into the car (ie: Recirc button *not* pressed) and turn the
fans up full blast.
That will dry out the expansion coils, helping to avoid creating a
bacteria-friendly environment in the coil.
And don't smoke in the car!
'00 s4 6spd
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