Westboro mixes post-war bungalows with new infill. Squirrels get into the older houses through soffit corners; raccoons like the flat and low-slope roofs on additions.
Construction next door often pushes animals into neighbouring houses. If a lot on your street was just cleared, check your roof line.
One-way door on the entry hole, heavy-gauge screening on vents and roof edges, and a check for kits before anything is sealed.
Find the chewed gaps, install a one-way door, and seal the roof line so squirrels can't chew back in.
Seal the house, fit one-way valves at the exits, and do it only outside the pup season.
Remove contaminated insulation and droppings, sanitize, and re-insulate once the house is sealed.