This clutch was found in my mother's closet today. She's had it for over 10 years. There are some white marks on it. I have no clue what it is or how it got there. My mother used this item very very VERY sparingly. I don't even think shes used it more than 5 times total. Anyone know if these marks are removable? Any suggestions how I might be able to clean it off? Thanks much!