you need to steralise your system. firstly remove your pollen filter and bin it, spray in aircon steriliser into the front of the car where your air intake is for your cabin air(can be bought at halfords or goto somewhere like eurocarparts...see yellow pages for your nearest depot.) then run your system on full whack for a good half hour. Replace filter with new one(eurocarparts) and bobs your uncle. This will of cleaned all your system from the evaporator and through your vents. Listen everyone, stop listening to bad advice over your aircon, you must as a matter of routine have your aircon serviced at least bi yearly. you must run it once a week to keep your system lubed up preventing seal and o ring failure. I am a trained aircon engineer not a rumour spreader. hope this helps all.