noun / verb
grime
GRYME/ɡraɪm/
Dirt stuck firmly to a surface.
A stubborn layer of grime coats the metal around the burner.

Etymology
Grime probably continues Middle English grim, meaning dirt or filth, but its origin is uncertain. The selected sense emphasizes dirt firmly embedded in or clinging to a surface.
In context
towards the sewer gratings the door which faced them was blotched and discolored and a faint light in the fan pane above it served to show the dust and the grime which covered it
More examples
- She scrubs the stubborn grime from the tiles.
- The machine is grimed with dust and grease.
- A clean patch appears beneath the layer of grime.
Forms
grime · grimes · grimed · griming