leichenhaft

I've just joined the forums in hope to find some help with this issue. Might even be the wrong forum but I don't know where else to write. I've had these toys since I was a kid and always took extra care of them, they were never dirty before. But recently I returned home and found them in one of my bags, and some of them had unusual stains. I tried removing them with everything : soap, nail polish remover, baking soda, rubbing alcohol and dish soap. It's like they are bruised. It's very unusual, I tried looking for solutions elsewhere too but couldn't find any simmilar examples. I attached a few pictures for example below. My theory is that the bag stained them. Again, the bag was also clean which was weird to me. Could the dye have rubbed off or something? Anyway, that is basically everything I could say about this. If anyone has any idea on what this is, please let me know, I'm kinda really sad since these were some of my favorite toys from my small collection.