What smell do roaches hate the most?
There aren’t very many smells that are known to repel cockroaches. The survival instinct of roaches is very strong, so they will do just about anything to get food and water. The best way to repel roaches is to create a barrier of entry between your structure and the outside world. In addition, if you keep your home free of clutter and try and dry up any moisture issues, this will definitely make the structure less inviting to roaches.