Hi again!

I have a large, acrylic painting that's whites to dark grays. They're very blue whites and grays, which don't go with a single thing I own. If I didn't love the painting and the long-gone friend so much, I would probably not hang this.

I was wondering if there was a wash or something I could wipe onto this to tone down the bluish tones? It's so intrinsic to the colors I don't think it's possible, but any ideas?!?

Thanks.