A few months ago, I bought three Vested Gentress dresses at an estate sale and was about to list them when I discovered that two of them had old-looking yellow stains on the front. Discouraged, I put them away. Well, I was feeling ambitious today and thought, what the hell, I have nothing to lose. So I brought out the Clorox bleach pen, which I have been afraid to use up to now. I squeezed out some gel onto the stains, waited a minute, rinsed it out -- looks good, but not perfect. Repeated steps a few times on both dresses, then machine-washed and dried. Voila--all stains are gone, no fabric damage. I think it's important to rinse the bleach off quickly or it will damage the fabric. These dresses are 65% poly, 35% cotton and the stains were on the pale background color (luckily).