Identify the number of Squirrels in your attic:
It is important to go in to your attic and try to identify how many squirrels might be living there. Carefully look around and check to see how many squirrels could be living in your attic. This will give you good idea of how much work will be required to remove them.
Check for Attic entrance holes:
Look around your home, especially near the attic for different entrance holes that squirrels are possibly using gain access in to your home. Squirrels basically chew holes in to the walls, these are a sure shot indication that animals are coming in.
Block Attic entrance holes:
Take some wood and if possible nail shut the access holes. Be sure to close all gaps that might be visible in the wall as well.
Buy and Set Live Traps:
Go to a decent hardware store and buy live bait traps that you can use to capture the squirrels. Use bait like nuts, fruit or peanut butter to lure the squirrels in to the trap. Live traps will catch the squirrels without injuring them. Once you have caught a squirrel, find a suitable place to release him far away from your neighbourhood. When you set live traps be sure to check them as often as possible to see if you have caught something.
After you have caught and relocated all of the squirrels, it is important to thoroughly clean the attic space. Pick up all the waste products and use a strong disinfectant like bleach in these areas.
Inspect outside areas regularly:
To ensure that squirrels are not getting back inside, try to inspect the outside areas of your home for new holes or gaps that might have formed. Do your inspection at least once or twice a month to be sure you are not getting any other animals inside the attic as well.