German cockroaches will feed on almost anything, including soap, glue, toothpaste, furniture, and more. German cockroaches are good hitchhikers and often find their way into new structures via grocery bags, cardboard boxes, drink cartons and secondhand appliances. German cockroaches prefer to live in warm, humid places close to food and moisture sources. They are frequently found in residential and commercial kitchen environments and bathrooms, but have the capability of living in any portion of any heated structure.