Can you kill stink bugs with hot water and soap?

No, a soap and water spray does not control stink bugs.

Stink bugs also may be called shield bugs. Specifically, a hardened outer set of wings covers the lighter wings that are used for the bugs' brief, clumsy flights. The homemade soap-and-water spray and the store-bought insecticidal soap may be effective controls of soft-bodied pests, but cannot penetrate the bugs' outer body.

Vacuuming up stink bug bodies and burning or immediately disposing the sealed vacuum bag are among the organic controls inside the house.