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You can find anti-rat sprays in most home department stores that may be worth a try. Spray them along fences and in areas where you don’t want rats to go (like around decks) and they may think twice before approaching. For a natural version, you can try a mint spray, since rats generally dislike mint. But even the most effective sprays are unlikely to stop a hungry rat over time.

Unlike for rats and mice, poisonous baits and fumigants aren’t a legal option for dealing with squirrel invasions. So, don’t set any traps up using standard rodenticides. Remember that you typically need a permit for trapping and relocating squirrels found on your property. Some states even specify the types of traps you need to use.

Yes, water misters can temporarily keep mosquitoes and other flying insects away, as these will wet their wings and make them unable to fly. However, as soon as the water stops misting, the insects will return, so it’s not a permanent or long-term solution. It’s also worth noting that it will only deter mosquitos in the direct path of the mist; any humans looking to avoid the insects will have to get wet.

Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.