Hot soapy water in a spray bottle? I don't think febreze has stuff in it that would attack the plastic, so they're probally just gummed up....... a old toothbrush to work the soap in would be good.
Next time you want to freshen your air ducts spray Lysol in the intake vents outside the car at the base of the windshield with the blower fan running......... that's were the cat sprayed and gave you the gift that keeps on giving.
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