Birds Problem at Apartment

If you have birds creeping under your roof tiles and building nests and doing business there, what do you do?  I had a tenant who solved this problem for me, he called his own handyman contractor to climb through the plaster ceiling, cleaned the place and put wire mesh at the openings so that birds cannot fly in anymore.
Although I had to pay for the services, the problem was solved for me once and for all.

Bird droppings causing discoloration of ceiling

Hole cut into plaster ceiling to access under roof

Wire mesh added to prevent entry

Roof hole closed and repainted