There is a product called XenTari which is a bioloogical control, so safe for children pets (and bees). Don't forget to give the box a good feed to help them recover.
I’ve used Xentari and it worked for me. Just a note the effects are gradual and not instant. I dissolve the granules in water and spray using a 2L pressurised pump action hand sprayer (about £8 on Amazon).
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