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Take a look and make sure water is draining from the evaporater . (water dripping under the car when the a/c is running) If it is plugged up and not draining you will have a hard time getting rid of the smell.
 

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The best way is if you have an air source like an air compressor that you can use to blow air in the drain tube. If you don't have air then you need to stick something in the drain to try to open it beiing carefull not to go in to deep. You should be able to find the drain on the firewall toward the bottom.
 
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