(Sterling International) Rescue! W-H-Y Spray renders pests helpless instantly and dead within seconds. W-H-Y Spray is a concentrated blast of natural plant oils that overwhelm the insects' senses. Effective against wasps, hornets, and yellow jackets, as well as their nests. Coats, penetrates, and destroys nests, repelling insects that attempt to return. Safe to use any time of day on visible nests. Safe when used around people and pets.