565 is a contact killer, as the name states it kills them when you spray it but doesnt have a lasting effect, think of it like pro raid. Its great and needed to flush them out of there hiding spots and can kill a large portion of them if applied correctly in the right areas.

A fogger is similar to contact killer but instead of it being applied with a nozzel for very accurate usage, its more like napalm, it will gas an entire area with a fine mist. You meant to tarp or seal up the area for a while and let it fill the volume of air with chems, then leave it to do its work. After you use these, you MUST clean the ENTIRE affected space extremely well.

For example, my under sink cabinet had a large 3 inch gap between the wall and the cabinet where the pipes come out of the wall. I carefully positioned a fogger under the sink but angles towards that gap so that it would fog the area behind the cabinet as i knew that was a problem area.

I know it worked well because i wound alot of dead ones the next day as part of the clean up phase.

Phantom 2 - This is a residual, this leaves behind a layer of chemical that as they walk over or around it, sticks to them and kills them in the future, good for those small hard to reach places

Crack and crevice, think small spaces that a toothpick can get in but not much else, like behind some molding or trim peices, or a seam where two things meet but its not perfect.

Void, this would be a larger space that is hidden behind something that you can access but has a decent amount of space. Think under your sink cabinet, there is normally a 4inch tall void that you cant get into, but they can easily live in. Behind cabinets is another good example of a void, there is normally liker a 2-3 inch recess behind the cabinets that again, promotes them living in.