There are several ways to kill stink bugs instantly, according to the search results:

1. Vacuuming: Stink bugs crawl slowly, so they are easy to kill with a vacuum cleaner. Once youve sucked them up, remove the bag and put it in the outdoor trash.

2. Chemical sprays: Common chemical sprays contain deltamethrin, a pesticide known to kill stink bugs, and can be used near common entry points or around windows or other spots where the bugs like to congregate.

3. Homemade sprays: A homemade spray containing dish soap and white vinegar can kill stink bugs on the spot. Fill a spray bottle with 1 cup of hot water, 1/2 cup of vinegar, and 1/4 cup of dish soap. Then spray the bugs directly when you see them.

4. Sticky traps: Fill metal pans with soapy water in a sunny spot in your house or under a light source. Stink bugs will be attracted to the light and will drown quickly.

5. Dryer sheets: Rubbing dryer sheets on window screens or at home entry points can be a great way to keep bugs at bay. Dryer sheet odor offends stink bugs.

Its important to note that stink bugs release a foul odor when they are disturbed or threatened, so its best to avoid touching or squashing them.