grime


grime (http://definr.com/grime)

     n : the state of being covered with unclean things [syn: dirt,
          filth, soil, stain, grease, grunge]
     v : make soiled, filthy, or dirty; "don't soil your clothes when
         you play outside!" [syn: dirty, soil, begrime, colly,
          bemire] [ant: clean]