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

1. Soapy water: Stink bugs often drop straight down when they feel threatened, so you can fill a wide-mouth jar with soapy water and move it into position beneath a stink bug. Most often, it will drop right into the suds and drown. You can also fill a bucket with water mixed with 1 teaspoon of liquid soap or detergent and knock the bugs into the bucket from plants or walls.

2. Vinegar and dish soap: 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.

3. 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.

4. Vacuum: You can use an insect-trapping vacuum or similar bug zapper to remove stink bugs without smushing them or causing distress.

Its important to note that stink bugs have developed a resistance to commercial pesticides, and their stench makes it extremely unpleasant to squash them. Therefore, prevention is the best mode of defense. You can prevent stink bugs from entering your home by sealing up any cracks around the house where they can enter, checking for broken screens, and applying fast-drying, fume- and stain-free insect barriers around windows, doorways, and other entry points to your home.