Factory Seat Cleaning

[messyfries]

I still haven't changed my seat cover. Not interested in leather seats and would like to retain the factory cover. Here is what I have now https://www.allmoparparts.com/sku/82213702.html. Hoping you can check the material. I already have 3 different kinds of bottled I got from target but still, the yellow marks are still there. Is it safe to bleach it (will use the color-safe bleach)? I also vacuumed everything.