All these methods will kill roaches without you touching them, for sure. But if you leave the dead roaches behind, they'll attract other roaches and insects like ants, spiders, and centipedes. It's certainly not something you want to happen.  The dead roaches must be removed from your home by vacuuming.  You can remove dead roaches with a broom if you find them in hard-to-reach places.  If you vacuum, do not throw out the vacuum cleaner's dust bag with dead roaches in your home or yard's trash bin.  In addition to that, dead roaches will attract ants and other insects that feed on them.  It would be best if the dust bag with dead roaches was disposed of away from your house.