Hello! I bought a comforter that was supposed to be white, but compared to my white sheets, pillow cases, and curtains, it’s a very yellowy off white. It really bothers me, but I love the comforter. I tried bleaching it and it looks exactly the same. I read something about Rit Dye but there are multiple kinds for whitening. I don’t know what to do, any suggestions to get my king size comforter pure white?