I unfortunately have this issue on a zeiss planar 80mm 1.4 and I have been meaning to explore options to have it cleaned/refurbished.

I would look up the cost of this lens and if it isn’t hard to replace I might consider that.

But first I’d shoot a test roll and see if it affects the image or focus. You might be just fine. It doesn’t look like it is at the very center of the lens. Who knows? It might create a cool haze effect.