How to make scene dirty and aged easiest way?

Hello! I am almost finally done with my first project but i have a huge issue…I need to make the scene dirty and aged.

Some guidance in what i want: On top of the cloth washer, maybe some mud and a footprint,
around the place where the water is in the water tap station thingy, some dried up dirty water.

The cabinets i’m not even sure how im suposed to age…

The walls would be nice if there was a cracked off tile, but thing is the wall is just flat with a normal map.
Maybe some lime-tracks on the floor near the shower.

But most important: Dirt. And not just a texture or something i mean dirt with a mesh.

i am using The last of us’ main screen as inspiration.

google for " grunge maps " or " grunge textures ".