殺虫煙霧 working just like 殺虫水, the spray will left on flat surface and you have to clean every flat surface thereafter. I used 殺虫煙霧 before I move into the apartment with no furniture and stuff. It may not be suitable for you if you are already living there.
I would recommend to use 殺虫水 instead and spray particularly at all drain point. Make sure that there is no sources of 甲由 inside your house.