Exallion
Hello Exallion, when we had a flea problem when I was a kid, my Mom had us put Borax (a powdered cleaning product) along all the edges of our rooms where the wall met the floor and push it into the gap, and rubbed it into the cracks between any wooden floorboards. It's supposed to kill eggs and newly hatched fleas that were laid there. This wasnt the only thing we did but I felt like it was part of the solution. After the infestation was gone we vacuumed it all out. Hope this helps!