I've been told that the "sell by" shelf life of good perfume is considered to be about 6 months by the manufacturers. That must mean that a lot of perfume gets pulled off shelves and disposed of somehow.
Around the house, I'm wondering if old perfume couldn't be used to discourage insects and other pests around your property. I've heard that mothballs in flower beds will keep even snakes away. (don't know how true that may be.)
As a test, you might try soaking something (cotton balls) in some of the perfume and putting them in an ant bed and seeing what the reaction would be.
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