How to get rid of cockroaches?Switch off the fan and air conditioner and keep windows and doors closed while using the spray and for 20 minutes after spraying. We recommend you use this spray at night.This is a repellent, and will not kill the cockroach, instead, it is a more permanent solution, and keeps cockroaches away for 4 to 6 months. Apply spray liberally at wall corners around dustbins in the kitchen area, on the inside walls of kitchen cabinets, under the kitchen sink, bathroom nanny trap area and any places where cockroaches roam.To effectively eliminate cockroaches, use this spray once a day for 10 days. After repeated use for 10 days, our natural cockroach repellent will ensure that you are free from cockroaches for 4 to 6 months.