The fibres of a synthetic carpet become damaged when walked upon, so that they trap dirt more easily. hg carpet & upholstery cleaner removes the dirt & fills up the gaps in the fibre surface with a dirt repellent layer. woollen carpets have more or less the same problem, as the natural wool grease gradually disappears. Hg carpet & upholstery cleaner replenishes it with a dirt repellent material. treat the stains beforehand with hg spot & stain spray cleaner. now spray the hg carpet & upholstery cleaner using a special machine & vacuum the surface immediately or brush thoroughly. rub dry using a towel. One litre is sufficient for 30 square metres of floor surface area.