By Brush:
To promote the cleaning action of the upholstery cleaner, use it with a soft-bristle brush. It is recommended that you use a soft-bristle brush to reduce the likelihood of damage to your fabric seats. Using a brush in combination with the cleaner, will help lift the dirt up for easier extraction. You may notice a slight foaming of the product upon circular motions of the brush being used. This just means the product is working, so not to worry.
By Steam:
Alternatively if you have a steamer, that too can be used instead. Similar to the above, hot steam also works effectively to lift up dirt and grime. Especially for water-soluble stains eg. caused by liquids, steam works great.