Q: I have left a few stubborn dirt on my leather sofa for 5 years. I can't wipe it off with water or detergent. How can I quickly remove them? A: You can take an appropriate amount of egg white, use cotton cloth to extract, repeatedly wipe the leather sofa and other places where the surface of the leather products is dirty, can effectively decontaminate. Since the egg white has a certain polishing effect, it will also give the leather its original luster after use. Tengyu Weaving , https://www.tengyuweaving.com