Biokill Insecticide is a perfect prevention product. We suggest to spray in problem areas in regular intervals (refer to Q4) as prevention. If insects are found, try to trace origin and spray nesting places, places of entry, cracks and crevices. Remove all possible accessible food sources, dispose of garbage daily. Keep lid of garbage can closed at all times. Remember: prevention is the best precaution and eliminating the cause is the best prevention.