Weego twin carrier

Weego twin carrier for sale I am the second owner (according to the person I bought it from) I used this carrier for about 20 minutes and didn't try it again until my twins were too big. When I bought this carrier, the owner claimed it had only been used 1-2 times and was in new condition, however after my own time with it I've noticed some staining that did not come out with regular washing. I chose not to stain treat since i wanted to resell it and be mindful of those sensitive to different products. Please see photos for stains. They are hard to see IRL and I had trouble photographing them but did my best. I have thoroughly inspected the carrier and can't find any other flaws retails online for $169