Grime
Grime , noun
[Compare Danish grim, griim, lampblack, soot, grime, Icelandic grīma mask, sort of hood, OD. grijmsel, grimsel, soot, smut, and English grimace.]
Foul matter; dirt, rubbed in; sullying blackness, deeply ingrained.
Grime , transitive verb
To sully or soil deeply; to dirt. — Shakespeare