Do not use any kind of chemical pesticide or roach foggers inside the refrigerator as it could poison your food and prove to be fatal. Throw out all the food from the fridge once an
Roaches like to infest fridges because of the warmth in the motor and the water condensation. Sprinkle boric acid underneath your fridge, oven, and other kitchen appliances and apply bait into any cracks and crevices in the back. That should make it inhospitable to nest in.
Most cockroaches will die if trapped in a refrigerator or freezer for an extended period of time. However, the exact length of time that it would take for the cold to become fatal would depend on a number of factors, including the species of cockroach and the temperature of the refrigerator or freezer.
Go disinfect your refrigerator with a solution of water and white vinegar (ratio of water to vinegar formula available online, somewhere) so your refrigerator has no toxic chemical in there and is clean and sweet-smelling but not the kind of sweet that attracts bugs.
The next step would be to stop using bombs. Bombs are not an effective way of eliminating roaches by any stretch, as they not only kill ONLY the roaches that are out in the open when it goes off (bombs do not get behind walls or baseboards) but often using large amounts of them can make the problem worse.
Some strong scents, such as lavender and mint, have been known to repel cockroaches.
Wipe the inside of the empty refrigerator with hot, soapy water, then wipe with clean water to rinse off soap. Dry with a clean towel. DON'T FORGET TO WIPE INSIDE THE DOORS AND ANY DRAWERS THAT CANNOT BE REMOVED. USE A SOLUTION OF 1 TABLESPOON OF LIQUID BLEACH IN 1 GALLON OF WATER TO SANITIZE YOUR REFRIGERATOR.
Cockroaches are one of the most common insect groups known to overwinter in obscured areas within homes. These unsanitary insects are especially common behind stoves, refrigerators and dishwashers where food waste and moisture has collected.
If keeping any longer, chill them in the freezer to kill them quickly (see Killing below); wrap green or cooked Bugs or Bug meat in plastic wrap or place in an airtight container and refrigerate for up to 2 days (from when they were alive) or freeze for up to 3 months below -18ºC.
Citrus is one of the scents cockroaches are most known to hate, notably lemon and orange. Keeping a dish of lemon juice on your kitchen counter can deter these pests, as well as placing lemon peels around the home to discourage cockroaches from coming out of hiding.
Warmth: The motor and other mechanical parts of a fridge often emit warmth, which cockroaches find inviting. Moisture: Refrigerators can also produce condensation, providing cockroaches with the necessary humidity to survive.
No matter how clean your home is, if there's some excess moisture somewhere, it could very well be an attractive invitation for your neighborhood roaches. This is one of the reasons why you'll commonly find roaches hanging out in your bathroom and laundry room or around an appliance that produces condensation.
Examples of roach nests
In kitchen drawers: Kitchen drawers, like refrigerators, are close to food sources and are dark and enclosed. In cupboards: Cupboards, cabinets or pantries are great spots for cockroach nests because roaches can hide from people and can easily access the resources they need.
Keeping Pests Away
Borax is very effective at keeping them away from your appliances and your home at large. Just sprinkle it in areas that are often infested such as under refrigerators, stoves, and sinks.
The scent emitted by the peppermint oil will act as a barrier, making these areas unattractive to roaches and encouraging them to seek shelter elsewhere.
The sugar will attract the pests while the baking powder will kill them. You can also place white camphor balls or insect powder around and under the exterior of the fridge to repel ants and cockroaches. However, be careful not to put any of these products inside to avoid contaminating your food.
Kitchen appliances attract cockroaches more than you'd ever like to know. Roaches hide in toasters, coffee makers, blenders and firdges. This doesn't necessarily mean they will use these appliances as life-saver boats when you're moving, but it's still important to keep a good eye on these.
KEEP FOGGERS AWAY FROM IGNITION SOURCES:
Keep it away from any live flame or pilot light. Avoid using electric stove or heater and on-off cycling appliances such as; refrigerators, humidifiers, air purifiers or air conditioners.
All items such as food, feed, drugs (including tobacco) and medicines not adequately packaged (including those items in refrigerators and freezers) must either be removed from the structure being fumigated or sealed in protective Nylofume bags.
Clean the Refrigerator Interior
Fill a spray bottle with a cleaning solution of two tablespoons baking soda and a quart of hot water. Apply the fridge-cleaning spray to all interior surfaces of the appliance, including the walls, non-removable shelves and the inside of the door.
Cockroaches are blessed with an amazing sense of smell. This is what they use when seeking food and mate but at the same time, this is also their weakness. A cockroach's sense of smell can be used to get rid of them.
There's a long-running joke that cockroaches could survive the apocalypse, as getting rid of unwanted roaches is difficult if you have an infestation. But if you want to kill them on contact, all you need to do is reach for your handy bottle of Pine-Sol! Considered a "contact insecticide," it kills them quickly.