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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.

Pest control timelines depend on what services are being provided, size and type of infestation, and size of your home. Some inspections can take an hour or more, while preventative treatments only take 30 minutes to complete. Basic spaying for a problem like roaches or termites can take about an hour for small homes, but much longer for large properties and infestations. Consult your pest control pro for a time estimate based on your situation.

In most cases, a mother bird will return to a disturbed nest after the disturbance has passed. However, it can be hard for a mother bird to find a relocated nest. So, while it’s false that a mother bird will abandon her nest if it’s been disturbed, it’s not a good idea to relocate a nest with live babies or eggs in it.

Both spikes and loose nets can be installed over nest sites to prevent the bird from returning, but nets are not a humane option since birds and other wildlife can get tangled in them. 

Spikes are a humane alternative that deter nesting without harming the birds. In small areas, like vents, a very fine mesh net can be installed to prevent the bird from returning. These nets don't generally pose a risk to the birds.