This question was submitted from Gunner.
“I got a used couch (dark blue) and there are yellowish stains on the arm rests and end of the seats. Could you help me?”
The yellowish stains on the upholstery are most likely human skin and oils ground into the fabric fibers after a significant amount of use. The staining is more prominent because of the dark blue color of the fabric.
You would find that if the fabric was brown or beige in color that this type of staining would be less visible.
The solution is to have the upholstery professionally clean by an IICRC (Institute of Inspection Cleaning & Restoration) certified carpet and upholstery cleaning company. They will have the appropriate cleaning/fabric knowledge, chemicals and equipment to effectively handle this soiling condition.