soiled -
soiled or likely to soil with dirt or grime; "dirty unswept sidewalks"; "a child in dirty overalls"; "dirty slums"; "piles of dirty dishes"; "put his dirty feet on the clean sheet"; "wore an unclean shirt"; "mining is a dirty job"; "Cinderella did the dirty work while her sisters preened themselves"
scummy covered with scum; "the scummy surface of the polluted pond"
smudgy smeared with something that soils or stains; these words are often used in combination; "oil-smeared work clothes"; "hostile faces smirched by the grime and rust"- Henry Roth; "ink-smudged fingers"
snot-nosed,
snotty dirty with nasal discharge; "a snotty nose"; "a house full of snot-nosed kids"
sooty covered with or as if with soot; "a sooty chimney"