The answer to 'how to prevent stink bug' is to use a combination of exclusion, removal, and prevention methods. Seal any cracks and crevices around your home to keep stink bugs from entering, remove any standing water sources, and use natural repellents like peppermint oil or garlic. Regular vacuuming and cleaning can also help eliminate stink bugs inside your home.
For severe infestations or hard-to-reach areas, it's best to call in a professional pest control technician who can properly identify the problem and apply targeted treatments. They have access to more effective products and techniques that homeowners shouldn't attempt on their own.