So weird. I can't imagine what it is. I treated it as best I could with Fels-Naptha soap, which rarely fails to get the job done. Oh well...what can you do. At least the spots aren't on the front.
Lol, not a shameless plug I swear, but I've had this before and Oxyclean is the only thing that worked. Hope that helps
@Aron @Memo I read the dawn trick a while back on a life hack sorta page. I’ve had some success w it. Get the orig blue if ya try it.