(Those ugly black lines around the baseboards and under doorways)
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This type of soiling is difficult to remove because the soil particles are so fine that they penetrate deep into the carpet pile, sometimes into the backing of the carpet. Can it be removed? Sometimes. With special products, time and effort, reasonable results can sometimes be achieved. To help prevent filtration soiling, vacuum and wipe the edges of the carpeting on a regular basis. Be careful around the tackstrip on the edge of the carpeting, it could nick your fingers!
