This recipe is one of the best to get rid of cockroaches. Out of all the variants I've tried, this is the most effective. It’s simple to make and you only need everyday household items.
The fresh onion is what really makes this recipe. Cockroaches are attracted to onion so the balls will start working immediately. But as the onion starts to decompose it continues to attract cockroaches. The balls also help to slow the decomposing so they’re effective for quite a while.