Some methods of millipede eradication include physical removal, use of chemicals, use of non-chemical pesticides and exclusion. Although millipedes are relatively harmless to people and pets, it is possible to suffer from an allergic reaction upon contact. At the very least, they can be an annoying pest in large numbers.
Get rid of the millipedes in the home by sweeping them out or sucking them into a vacuum cleaner. For larger infestations, use an industrial shop vac.
You can also use chemical pesticides to eradicate millipedes in the home. Apply pesticides around the perimeter of your home, along cracks and crevices, and around doors and windows. You can also kill them on sight with chemical contact sprays. Active ingredients to look for include amorphous silica gel, propoxur, piperonyl butoxide, deltamethrin, hexa-hydroxyl and cypermethrin.
Natural pesticides include diatomaceous earth and boric acid. Diatomaceous earth inflicts small cuts in pests, causing them to dehydrate and die. Boric acid works in similar fashion, cutting and dehydrating them, but also functions as a stomach poison.
Once you get rid of existing millipedes, keep them from coming back by excluding them from the home. Exclusion involves sealing up cracks and tiny openings with sealant and a caulking gun. Diverting moisture away from your home is critical, since millipedes thrive in moist environments. Mixing dry wood ash into the soil around your home deprives them of a place to lay their eggs.