Spraying / Misting with suitable acaricides (chemicals) at the areas infested by spider's upto safely accessible heights. Cracks and crevices, corners of walls, wall and ceiling junctions will be treated. The cobwebs have to be removed prior to treatment by the client to avoid staining of the walls due to the cobweb dust. In critical non spray areas such as production in sensitive industries the cobwebs to be removed by the client by using vacuum cleaner etc.
Quarterly i.e. four times a year however for industrial establishments the frequency shall be decided based on the type of premises, the level of infestation and the immediate surroundings.