Clarks leather Brown Loriann Jeni ballet flats

Clarks leather Loriann Jeni ballet flats Brown Size 8 These were my personal shoes that I didn't wear. They were tried on and then lost in the back of my closet. I recently downsized my home and I am trying to adopt the "if you haven't worn it in 6 months, get rid of it rule." There were stickers in the footbed that I used goo gone. The residue from the sticker is not sticky anymore but turned a darker color. I have not idea how to get it out. See pictures and video for condition. No box 100% Leather Imported Rubber sole Heel Height .55 inches Ortholite footbed Full Grain Leather Flexible Rubber outsole