Now is the time to treat spiders. A spider treatment done early in the season will help keep the little pests at bay for most of the summer. Once a treatment is done it is best only to brush down the spider cobwebs.  The average cost to treat the outside of a house and the roof void [ insect dust ] plus small sheds is between $120-150. Included is also treating the fence capping. We service  Bunbury, Australind, Eaton, Capel, Boyanup, Donnybrook, Harvey, Collie  and everywhere in-between.