I have a problem with tiny black beetles in my food cupboards. In the past I kept having to throw stuff like flour out when it was only part used, so I started putting everything in plastic containers or jars. Now Ive found them in the corner of the cupboard, and under the lids of the plastic containers. They're driving me mad! Does anyone know how I can get rid of them, or am I doomed to having to throw out stff after a few weeks?