FAQ Search Select a Category Cleaning Formulas Cleaning Tips Corporate Deep Cleaners FAQ Hard Floor Cleaners Parts and Accessories Steam Sweepers Vacuums Warranty Web Site and/or go Why do I need Acarosan?(2) Answer: Dust mites are the #1 cause of indoor allergens. In order to control dust mites and their re-population, it is important to use the Acarosan® spray and powder on a regular basis.