What about the dark color of the leather sofa?
Save money, wring the wet towel, wipe it over and over again, stick to warm detergent, and let it dry naturally. You can also use rubber, toothpaste, alcohol and other cleaning, life can use a lot of things, can make the color black place earn clean.
There are special cleaning liquid leather, supermarkets have sold. First wash with the cleaning liquid, then wipe with a protective agent, dirty place will be clean.
After cleaning, be sure to pay attention to maintenance, often to the sofa to protect the oil and so on, often used new.