[SuziQ]

I've always been afraid that bleach would eat through the thread.

You could try one of those non-bleach whiteners. Clorox 2, is a peroxide based cleaner. Oxy Clean sounds like a peroxide based cleaner, too, but like Wneighbor said, it may be TOO strong.

[Wneighbor]

Hey! I had forgotten peroxide Suzy! Sometimes you can just use regular peroxide from the bottle on spots and they come out.

[Corin Stormhands]

Thanks for the suggestions. We've just been too skeered to do anything. When I figger out where we've stored it, I'll take a picture and show you what I mean.