Bed bugs have several strong physiological aversions that can be used to repel or kill them. They primarily "hate" high heat; temperatures over 120°F (49°C) are lethal to adults and eggs, which is why steam treatments and high-heat laundry cycles are the most effective non-chemical controls. They are also repelled by certain essential oils with strong scents, specifically lavender, tea tree, peppermint, and clove. These oils contain compounds like menthol and linalool that overwhelm the bugs' sensory receptors. Additionally, bed bugs detest diatomaceous earth, a natural powder that clings to their exoskeletons and dehydrates them. While they don't "hate" cleanliness in a moral sense, they avoid "slick" surfaces like glass or high-quality mattress encasements that prevent them from climbing or nesting. While these repellents can deter them, they are rarely a standalone solution for an infestation, as bed bugs are remarkably resilient and can hide deep within walls where scents and powders cannot reach.