Confirm the squirrels are active in the attic
Seal all entry points after the squirrels are out
Install a one-way exclusion door on the main entry hole
Remove food sources near the house
Trim tree branches away from the roof
Secure vents, soffits, and roof gaps with metal mesh
Use humane traps where legal and appropriate
Relocate trapped squirrels according to local laws
Clean and disinfect the attic after removal
Replace damaged insulation and repair chewed wiring
Call a licensed wildlife removal professional if needed