A good home remedy for killing roaches is a mixture of three parts borax and one part sugar. After thoroughly combining the substances, sprinkle the mixture wherever you have seen roaches, such as along baseboards, in cracks, under cabinets and under the sink.
The borax and sugar combination works because sugar lures the roaches to the particles. The borax works the same way commercial roach killing spray does: It dehydrates the roaches' exoskeletons.
Another home remedy for getting rid of roaches is baking soda mixed with a bit of sugar as bait. Distribute this in infested areas, such as behind the refrigerator.