The white PU skin is stained, which is indeed a headache. Don't worry, though, here are some ways to help you with this.
First, you can try using alcohol for cleaning. Alcohol is a great cleanser to remove most of the stains and stains. You can use a clean cloth or cotton ball dipped in some alcohol and gently wipe the stained area. Take care to use appropriate force to avoid damaging the leather surface.
If alcohol cleaning doesn't work, you can try using some specialized leather cleaners. These cleaners often contain special ingredients that remove stains and stains. You can follow the instructions for use of the cleaner, but be careful not to use too much to avoid damaging the leather.
Alternatively, you can try using some household bleach to clean the stained area. However, be aware that bleach may cause some damage to the leather, so be very careful when using it. You can use bleach diluted or use only a small amount of bleach for cleaning.
Finally, if you are unable to remove the stain through the above methods, you may consider seeking professional help. A professional leather repair shop or dry cleaner usually has more specialized cleaners and techniques that can help you with your staining problem.
In short, dyeing the white PU skin is not necessarily an unsolvable problem. You can try the above methods to remove the stain, but be careful not to damage the leather surface. If none of the above methods work, you can seek professional help.