Method 1:
White wax coating: usually, leather shoes are made of water dyed leather materials for lining and insole, and decolorization occurs due to sweating of feet or water ingress into shoes when wearing, which is normal. White wax can be applied to the inside of the shoes, and the warm air of the hair dryer can be used to blow for about half a minute, so that the inside of the leather shoes will not fade in the future.
Method 2:
Use egg white: many people know that egg white can be used as a mask, which has good penetration and absorption capacity for leather egg white. A thin layer of egg white can be applied to the leather shoes with color fading inside, and then the shoes can be placed in a dry and ventilated place for more than 24 hours. When wearing the shoes again, the color will not fade inside. Egg white is also applicable to the foot grinding of shoes.
Method 3:
Go to a professional leather goods maintenance shop. The maintenance shop has a special solution that can specifically solve the problem of discoloration in leather shoes.