✔ 最佳答案
You can try nail polish remover which is a quite strong solvent(acetone type) . Before you use it , you can try to use it on some inconspicous spots to test it whether it may damage the leather . After the test then you can apply it to dirty area . However dried liquid paper without any glue is easy to be removed . Use alcohol or simply soap solution to wet the area , wait for awhile then scrub to peel the paper .