What smells do bed bugs hate the most?

Bed bugs have a strong sense of smell and are repelled by certain strong, pungent odors that irritate them or interfere with host finding, though smell alone will not eliminate infestation because hungry bugs will tolerate unpleasant smells to reach host. Smells bed bugs hate most include strong essential oils like peppermint oil, lavender oil, tea tree oil, eucalyptus oil, clove oil, and neem oil, which have some repellent effect and may disrupt their ability to detect carbon dioxide and body heat, though research shows limited residual effectiveness and they habituate quickly. They dislike strong spices like cayenne pepper, cinnamon, and black pepper, and strong chemical odors like rubbing alcohol, bleach, ammonia, and vinegar, though these are not recommended for use on beds due to toxicity, flammability, and damage to fabrics, and they do not kill eggs. Dryer sheets containing linalool are often claimed to repel but have minimal effect in real world. Desiccant dusts like CimeXa have no smell but kill by dehydrating. While these smells may cause temporary avoidance in small enclosed spaces, bed bugs will cross repellent barriers if motivated by hunger. Pest control experts consider scent repellents as minor supplemental measures, not primary control. Most effective methods are physical and heat based, encasing mattress and box spring in bed bug proof encasements, using interceptor traps under bed legs, washing bedding weekly on high heat, vacuuming mattress seams, and professional heat treatment.