Free People Cream Halter Lace Bralette

Free People Cream Halter Lace Bralette in size Medium. Worn very minimally, didn’t fit me right. Took this out to sell it and realized it has a blue discoloration/tint on the left side only. I have no idea what this came from, but I washed it and it didn’t come out — unfortunate but know that it is clean. Please refer to photos to see the blue tint. It isn’t super noticeable, as it is a faint blue but can be seen. Maybe some buyer knows a secret trick to get it out? I didn’t try bleaching it but