Cockroaches are a universal pest. They spread germs and disease, and are generally unsightly. While infestations are sometimes a sign of poor hygiene, quite often cockroaches will inhabit the cleanest of homes and businesses.
Fortunately most species are quite easy to eradicate with a simple annual treatment. Having your home or business treated annually also minimises the risk of being invaded by German cockroaches. These small, yellowy/brown critters can easily grow to the dozens in the cleanest of spaces, with infestations sometimes nearing hundreds of thousands.