Velour upholstery feels soft to the touch and has a rich, velvety appearance, but if the upholstery is allowed to become dusty and soiled, it will become stiff to the touch, and the colors will be dull.
Brush the velour lightly to remove any loose dust so it won't become further embedded in the upholstery. Use a vacuum with a soft brush attachment, if desired.
Fill a bucket with warm water and add a few drops of mild liquid soap such as pure castille soap or unscented dishwashing detergent.
Mix the soap and water together, but don't agitate it and make it foamy.
Dip a piece of muslin in the soapy water and gently but firmly wring out the excess water until the muslin is nearly dry.
Rub the damp muslin carefully in a back and forth motion over the affected velour upholstery.
Continue to dip the muslin in the soapy water, wringing it out until it's nearly dry each time and rubbing it back and forth until the velour is clean. Change to clean water and fresh soap if the water becomes soiled.
Allow the velour upholstery to dry naturally, and then brush it gently with a suede brush to restore the nap.
If the velour is very soiled, put a few drops of ammonia in the soapy water.