just bring your bag to LV shop, the will help you with that, because it's happen to me before and the remove it , i asked them about the product they use, but the don't want to tell meHi, marks on patent LV vernis bags are really hard to remove, and trying could make it worse.
You could see the LV Faq for more on vernis cleaning: Louis Vuitton FAQs
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they just said just bring the bag and they will do it for you for free