The difference between professional cleaning and domestic cleaning lies in the extraction. A hot water extraction machine sprays solution into the pile under pressure and immediately vacuums it back out along with the dissolved dirt, which means the soiling actually leaves the carpet rather than being pushed deeper. The amount of water left in the fibre is small, and drying takes hours rather than days. Method matters: wool and Persian rugs, with sensitive dyes, require pH-neutral solutions at low temperature, while a synthetic fitted carpet tolerates more aggressive treatment. A serious firm first tests colourfastness in a hidden area before treating the whole surface.
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