Soil Filtration Stains
Soil Filtration Stains are those dark lines running along the baseboards, in front of cold air giveback vents for the furnace, under extended hanging drapes, encircling edges of heat vents, sofa skirts, encircling plastic chair mats and along dressers or other furniture that does not get went very often. Soil filtration is caused by air (which contains various soils) being drawn through the nap of carpet or other fabrics. In the action of being drawn through the carpet fibers these airborne contaminants are filtered outside as it passes through. More information: steam pocket mop
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