The best permanent rodent exclusion materials for San Diego homes include sheet metal, galvanized hardware cloth

https://johnathanohjv668.clearminster.com/posts/why-you-should-never-vacuum-rodent-droppings-in-your-attic-2

The best permanent rodent exclusion materials for San Diego homes include sheet metal, galvanized hardware cloth, copper mesh, stainless steel mesh or wool, cement, and caulk for sealing gnaw-prone gaps.