Ключевые слова: background, blot, blue, bubble, cement, circle, compounds, concrete, construction, crust, detail, dingy, dirty, drain, equipment, filthy, grime, grunge, industrial, industry, line, maintenance, manufacturing, mark, material, moss, nasty, old, pipe, piping, plastic, pvc, service, sewer, slough, spout, stacks, stain, supply, system, texture, unclean, unsanitary, wall, washing, water, waterspout, work,