to be sooty; to be stained
soot-colored bamboo (coloured); bamboo duster (with the leaves still attached at one end)
cleaning dust etc. from rooms; housecleaning; (the traditional Japanese end-of-the-year, 13th December) big house cleaning; spring cleaning (only not in spring)
sweeping the soot from one's house (to welcome the kami of the New Year)
sooty owl (Tyto tenebricosa); greater sooty owl
sooty albatross (Phoebetria fusca)