I'm suspecting this either breaks down critical messaging / management chemistry, or carapace / cell-wall functions. I've had little luck determining or finding what the specific lethal mechanism is, though the method appears effective.

Upshot: a non-sudsing detergent or other fatty-acid denaturing agent should likely work. Formula 409 might work, ammonia is another possibility, though that in a shop-vac will have its own atmospheric issues (though the smell should dissipate in a well-ventilated area).

I'd arrived at the findings above through direct trial, after attempting a few others -- alcohol also works, though it's much more expensive.