What to pour down the drain to kill roaches?
The most important thing is just to keep your drains clean. Avoid food buildup in the drain and run disposal systems where possible. In addition, it is not a bad idea to wipe down counters, sinks, etc. to get rid of the excess moisture, as cockroaches need water to survive more than food. In restaurant settings, we often use microbial products to reduce buildup in wash drains and floor drains.