You try pyrethrins?? If you use the straight pyrethrins (no other chemicals added; usually bird mite spray...safe on pinkies) the residue they leave us inactivated by the time it dries up.
I use it on my mice to treat mites/lice on a regular basis (being housed at a pet shop my mice pick up mites occasionally from the other ones there) and have never had to stop selling to the public. I just wait until they dry off and they are good to go.
EDIT–are you using baking soda and vinegar for your CO2 generator?? Welding supply shops sell CO2 tanks for about $80 and on a tank exchange program...you only pay 15 bucks or so (don't quote me on it) for the new gas and just swap the tank out
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