You can spend a ton of money on an exterminator or use toxic sprays to get rid of a cockroach problem. Or, you can use this Roach Doctor Cockroach Killing Gel to rid your home, restaurant or workplace of these nasty little critters. It is easy to use, just dab it in the corners and crevices where roaches are likely to hide. After eating the formula (bait), the cockroaches will return to their hiding place and die within a few hours of consumption.