Diatomaceous earth may be your answer. Is it non toxic to humans and animals, you can sprinkle it just about anywhere and it can even kill mites!
The microscopic particles are very sharp its made of almost pure silica and what happens is the sharp particles scratch the waxy exoskeleton and the bugs just die from dehydration.
They even make a food grade diatomaceous earth and farmers are known for sprinkling it in their grain piles so they don't get bugs. You can sprinkle it in your hair, on your skin, and your dog can lick it and its still safe, and also cheap. Just make sure you get food grade and not pool grade.
When I bought my milksnake from a local petshop I asked about what do you do if you ever get mites, they use it all the time in the shop when they change the bedding and they don't get mites on their reptiles.
Here is a link that gives more information. I found it funny that the exposures to the earth are no worse than getting a little dust in your eye. Don't throw it in your eyes people!
http://npic.orst.edu/factsheets/degen.html
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