Preparation is key when it comes to Asian beetles. A properly timed exterior insecticide treatment can eliminate any infestations. Once the insects are in the house all you can do is vacuum them up. Never spray insecticides inside the house because they do not reproduce once inside.
During late winter or early spring, barrier treatments are ineffective because the beetles gained entry the previous autumn. Consider treatment before this happens.
To be effective, barrier treatments should be applied before the beetles enter buildings over winter. In Wisconsin, the proper timing for such treatments is early September thru the end of October.