no pest strips-
are relatively safe. the residual is minimal, BUT breathing the vapors can make some very sick. if you live alone put seven in there and in two days everything dead. if you have kids, use only while they are at school, then evacuate the atmosphere before their re-entry.
in order to be affective, pest strips must be used in a relatively sealed enviro. an eight inch crack three feet long flows the same as an eight inch diameter hole. said amount of leakage renders strips ineffective for shock and awe style warfare.
spraying dawn dishsoap and water every three days for a month kills them all. really preventive maintenance is the key. once there is an infeestation, there really are few cure alls.
i stay away from all oils, as the residual is fubar.
check into ionized water. most commercial greenhouses have a water ionizer on hand, and use the water to mist on a daily basis. stay away from miticides, as they are carcinogens.