'Bug bombs' are ineffective killing roaches indoors. Total release foggers, commonly known as 'bug bombs,' are ineffective at removing cockroaches from indoor environments, according to a new study. Bug-bomb chemicals fail to reach places where cockroaches congregate the most -- on the underside of surfaces and inside cabinets, researchers say. Besides leaving behind numerous cockroaches, bug bombs also leave behind nasty toxic residue in the middle of floors and countertops. Source 2a.