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Use a soft cloth to squeeze some toothpaste or colorless shoe polish and wipe it repeatedly, if it is very powerful, find a leather clothing refurbishment shop and ask them to apply some pulp.
If the mouth is not too big, you can use some leather pulp to try it, but if the mouth is large, you can return to the manufacturer to repair, or call a professional repair leather sofa master to repair it, hoping to help the landlord.
With cool oil, drop a little and wipe with a dry cloth.
Car detailing shops have leather cleaners.
Try wiping the inside of the orange peel, not only the orange peel and grapefruit peel also have a good cleaning effect. The effect of wiping it with tea should also be good. Especially in the bright and smooth furniture effect is good, I don't know what the effect is on the leather sofa, you try it!!
Removing a ballpoint pen oil from a leather sofa requires a sponge, a bottle of handwriting remover. >>>More