Lee, when using flea bombs one must remove all living things for close to three hours. The ones I found that I like use an eight cup of water or so to activate. I get the containers with water placed where I want them and have everything ready. When all ready I just drop the little can in the container with water all in sequence to the door. I don't have to hurry since it takes over a minute to start. Really nice to use. After it is over, the container that holds everything gets thrown in the trash. They work on squirrels also. .................bob
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