What is Onslaught? Onslaught is a broad spectrum pesticide that contains the active ingredient esfenvalerate, also referred to as S-fenvalerate.  While this main ingredient has been used in other types of pest control products, Onslaught provides a unique formulation that offers much greater residual control against the target insect pest.  This formula is has no odor, so it can be sprayed both indoors and outdoors.
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