I have this ivory colored bedspread set from the 40. It’s made from some sort of satin. There is yellowing all over the whole set. Some of it looks as though the yellowing is right along the fold lines. Some of it, there is no pattern to it. It’s pretty extensive yellowing. I have no idea what the yellowing is from. I am hoping for some suggestions on how to get rid of it. Here are two poor photos of the yellowing. It’s supposed to be sunny and in the high 80s the next 3 days which gives me a lot of time to hang them in the sun, if that would work?