Unwanted guests

I miss the sunny/warm weather but I’m dreading summer already (I’m staying here) because of the cockroaches that kept me company ALL last summer on Central.  How do I tell them that they’ve overstayed and are no longer welcome? [3549B]

[written in answer space:  usually it involves poison of some type]

Tell them they’ve overstayed their welcome by feeding them a mixture that’s four parts borax, two parts flour, and one part cocoa powder. Sprinkle the mixture in a line at the baseboard and get ready to enjoy a roach-free summer.