Birds are often averse to certain strong scents. For instance, the odor of predator urine, such as that from foxes or hawks, can deter them. Similarly, birds may dislike the pungent aromas of garlic, onions, and chili peppers. Essential oils like peppermint, eucalyptus, and citrus can also be effective in keeping birds away. However, it's important to note that individual bird species might react differently to these scents, so it might require some experimentation to find the most effective repellent for your specific situation.

When it comes to keeping birds from doing their business on your porch rails, you have several DIY options and home remedies you can try: 

• Tie a fishing line from one end of the deck post to the other. Birds won’t be able to see the line across the railing, so they can’t land on it.  

• Hang wind chimes close by, which may scare birds away. 

• Apply a bird gel repellent to the railings, which contains smells that birds generally don’t like. Or, similarly, you can apply citronella or lemon oil around the railings, since birds don’t like strong smells.

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.

DIY removal of birds or bats is not recommended due to safety risks and potential legal protections for certain species. While simple prevention methods can be done yourself, actual removal and control of an infestation should be handled by professionals who are familiar with safe, humane, and effective techniques.