Here are some smells that can repel cockroaches:

• Lavender: Cockroaches hate the smell of lavender, so planting it around your home can create a barrier that even the most determined roaches will be loathe to cross. You can also use lavender oil inside your home to chase existing roaches away and stop new ones from coming in.

• Citrus: Cockroaches hate the scent of fresh citrus, so you can use citrus-scented cleaners in your kitchen and bathroom to chase any lingering roaches away.

• Eucalyptus: One of the most powerful options for repelling cockroaches through scent is essential oils, such as eucalyptus or tea tree oil. You can use the eucalyptus scent in a number of different ways, from essential oils diluted with water and sprayed as a barrier around your home to plantings in your front yard and garden.

• Oregano: Oregano has a strong, pungent odor that cockroaches can’t stand. You can spray a mixture of oregano oil and water on countertops and any nooks and crannies they like to hide. Oregano can also be grown in planters and gardens to keep pests away.

• Mint: Cockroaches dislike the strong smell of mint, so using this scent in your home can be effective in keeping these pests away. You can grow mint plants or use mint-scented cleaning products.

• Garlic: Garlic has a strong smell that repels cockroaches. You can place whole cloves around the kitchen or sprinkle garlic powder in corners.

• Chrysanthemums: Although no hard scientific evidence exists, it’s believed cockroaches hate the smell of chrysanthemums.

• Bay leaves: The fresh scent of bay leaves contains beta-pinene which is known for repelling and even treating cockroaches. You can mix a few drops of bay leaf oil with some water and spray it around the house.

• Cinnamon: Cinnamon can be used as a deterrent in the kitchen. You can sprinkle cinnamon powder in areas where cockroaches are likely to be found.

• Coffee grounds: Coffee grounds can be used as a deterrent in the kitchen. You can sprinkle coffee grounds in areas where cockroaches are likely to be found.

Its important to note that relying on essential oils and herbs may not be enough to deter every kind of cockroach or pest. Therefore, its recommended to also keep your home clean and moisture-free, and to place food in airtight containers.