Don't overdo it! When I first received the bottle I sprayed most of the air ducts twice and was overwhelmed by the scent for about a day. I suggest you start by just spraying the air filter once and see how it works before proceeding. I think I will from now on. Although the scent is not entirely neutral, it does not resemble flowers or perfume. It's quite nice if I don't overdo it, and it takes out the musty sewer smell.
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