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I purchased MAC's filter cleaner when i got my CAI. i just soak it in that for a while then rinse it off with water and let it air dry. You should let it dry completely and don't use compressed air. Then i just reoil with MAC's filter oil and its good as new.
do you have a paper filter or an after market? a stock replacement from your local auto parts store should be like 5 bucks...if you have an after market cleanable filter K&n has a cleaning kit which contains the cleaning solution and some oil for like 10 bucks