The steam cleaner produces hot steam that comes out of the nozzle at two different pressures. This appliance does not have a suction function. If you apply this function to your upholstered furniture without making any further adjustments, moisture can form inside. Furthermore, the textiles can become deformed and broken due to the constant heat.
You can set your steam cleaner to the lowest steam quantity and steam strength. This will help you avoid heavy dampness. Afterwards, you should choose a brush on which you can place a cloth. I would only use a steam cleaner for stains or minor dirt.

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