You may see what looks like pepper on the wall or floor, which is actually roach feces. Or you may see little moving hairs in cracks, which are actually the tips of antennae.
To get rid of existing roaches, you’re going to use four proven tools: little monster crawling across the counter and need to kill it before it crawls out of sight? Use contact sprays. Hidden colony? Use residual sprays. A contact spray might be effective for anywhere between a few days and a few weeks after you’ve sprayed. A residual spray is designed to work for months at a time. For more information, you can check this source.
