Originally Posted by amma
Did you wash in warm water? If so you may have set the markings in. Most don't like any kind of warmth/heat.
You could try Awesome general purpose cleaner, a paste of your brand of dry bleach alternative, or hydrogen peroxide.
I'd reccommend the paste route, and use an old toothbrush to really get the paste into the marks. Let it sit for a bit, then wash out gently. This may help as well. Good luck, and please remember to post how you eventually whipped this problem so we can all learn from it!
Odessa