Spicy, powdered pepper of any variety is an excellent rodent deterrent to consider. You can apply pepper near the rim of the hole and even inside of the hole, which will send any nesting rodents fleeing, so be aware of this! This is an excellent method to use against a large rat infestation as well.
Vinegar has an unpleasant smell and if used in the pipes and u-bend it may temporarily keep them away. It can sting and would be unpleasant for the rat. Any strong smell may be enough to deter a rodent as it will make them wary that something has changed in the environment.
Essential oils are some of the best natural rat repellents. Rats have a highly developed sense of smell, which makes strong odors such as pine oil, cinnamon oil, and even peppermint oil offensive to them. Cayenne pepper, cloves, and a mixture of vinegar and ammonia will keep rats away as well.
Rats are afraid of human activity, mostly because humans are so much larger than they are. Rats also fear predators such as hawks, eagles, and other birds of prey. Other animals that rats are afraid of include your cat as well as rat terriers and other dogs that hunt rodents. Rats fear becoming a meal for a snake.
Baking soda combines with the stomach acids to produce carbon dioxide gas which rats are unable to tolerate. In turn, it builds up within their system and eventually causes internal blockage and rupture. Soon enough, you will have the rat-free environment you always deserved.
A really dilute solution of dettol shouldnt hurt but should stink enough to keep rats out - but I am still a bit cautious about spraying even highly diluted acid anywhere around my engine. I had faced the same problem with my Swift, where the building rats had chewed through a whole bunch of wires.
Sometimes you might want to flush out the burrow first to force out any rats inside. You can do that by using a hose to fill the burrow with water. This stops the rats inside from digging new holes after you've close them. Don't attempt to fill the burrow with dry ice, poison, or bleach to kill the rats inside.
So, after ingesting baking soda, this product reacts with the acids in the rat's stomach and creates carbon dioxide. This carbon dioxide then builds within the rat and causes a rupture or blockage that eventually kills the rat. This method may work, but there is no guarantee that it will be effective and is not humane.
This makes peppermint oil, chili powder, citronella, and eucalyptus the most common natural rodent repellents. Chemical smells, such as ammonia, bleach, and mothballs also work as mice deterrents.
Peppermint Oil
On a cotton ball use no more than 5 drops of 100% peppermint essential oil. Spread the oil on areas that you want rats to avoid, in your case, around the garden.
Pest Control – Eucalyptus is an effective remedy against pests like pantry moths, mice, or rats. To keep these pests out, place cotton balls moistened with two drops of eucalyptus oil in cabinets and drawers. For rodents, like mice or rats, the goal is to keep them outside where they belong.
While rats might leave a nest temporarily if disturbed, they will likely only nest somewhere else close by, no doubt creating multiple nests that exacerbate the issue. On top of that, there's also a risk that they will return to the same space if you haven't properly dealt with the nest.
Advantages. It's cost-effective: Using salt to deter rats is one of the most cost-effective methods of keeping these rodents at bay. Salt is readily available in most homes and hence doesn't require you to purchase additional products.
Place peppermint oil, cayenne pepper, pepper and cloves around the home to keep them away. Sprinkle crushed pepper, or spray a pepper spray, near openings and holes.
Sprinkle scents they don't like
A great way to bring mice out of hiding and steer them in the direction you want them to go is to sprinkle potent scents they find particularly unpleasant. Mice don't like the smell of garlic, onions, cayenne pepper, cloves, ammonia and alcohol.
Any new or unexpected noise will frighten them and send them scurrying. However, once rodents get used to a sound, they will no longer fear it. This means that ultrasonic repellents can be effective at first, but if an area has plenty of food and provides shelter, the rats will have a great incentive to return.
Seal any holes you find to stop rodents from entering. Fill small holes with steel wool. Put caulk around the steel wool to keep it in place or use spray foam. Use lath screen or lath metal, cement, hardware cloth, or metal sheeting to fix larger holes.
Use a long handled spoon or other device to put loose pellets or meal bait at least six inches into the burrow. Do not cave in burrow openings. Rats often relocate when stressed in this way. At the very least they will kick out the bait as they work to re-open the entry and bolt holes.
Essential oils that may be helpful in repelling rats and mice include peppermint oil, lemon oil, citronella oil, and eucalyptus oil. You can make an essential oil spray by mixing 2 teaspoons of oil with 1 cup of water or rubbing alcohol in a spray bottle. Then spray it anywhere you see traces of rodents.
All you need to do is mix 2 – 2 and a half cups of ammonia, 100 – 200 mL of water and a 2-3 spoonful of detergent in a bowl. Then, put it to places where rats are usually seen. The smell of ammonia is very pungent that it instantly kills rats.