As a retired Pest Control Operator, I will chime in and say that the best use for un-needed mixtures is to apply them according to label instructions.
Do you have any friends with houses? A simple application to the lower exterior walls is an approved use, but permethrin has a short lifespan and will quickly break down. So be it.
Permethrin spray is harmful to aquatic life, and can cause health problems in avians and felines.
And the drain is NOT an approved method of disposal.
Jim
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