2. If a small amount of residue remains after washing, it can be removed by soaking in hot soapy water or boiling. This method can be used for cotton and cotton polyester fabrics.
3. If the wool is stained with pen oil, first soak the stain in the mixed solution of trichloroethylene and alcohol (the ratio is 2: 3) 10 minute. At the same time, brush gently with a brush. After most of the oil stains are dissolved, clean them with low-temperature soapy water or neutral washing powder.