What gets this stain out?

Andrew, I've used this stuff before and it works well, but I don't know how well it will work on a stain that has sat there for as long as it will take to get the product<g>: http://www.porters.com/clearance/clearance-film-darkroom/rexton-photochemical-stain-remover-2-oz.html

I never were "good" clothes in the darkroom. Almost always a old t shirt and sweat pants. I have a shirt that I use just for loading film onto reels that hasn't left the darkroom in 12 years, when it got designated for this purpose do to a rip in the shirt.

Let us assume the stain is silver or a salt of silver. This is the likely culprit. First, you should try soap and water and also alcohol. No luck? This will sound crazy; dab the spot with fluid from a bottle of iodine. I am talking about the stuff you put on cuts as an antiseptic. Now iodine is a staining solution that ruins shirts. After allowing iodine to soak for a minute or two, immerse the stained area of the fabric in clean fresh fixer. "Shazam!" the iodine stain and the silver stain are vanished.

Silver is an opaque metal, the stuff of the image. A dab of iodine causes the silver and the iodine combine forming a crystal. Fixer (ammonium or sodium thiosulfate) is a solvent for silver salts and iodine. Try this technique; it might work.

If it's been heat set by the dryer, you're probably out of luck. Magic eraser may work (I've heard it's pretty good). I got one spot of fixer on a white blouse several years ago and caught it before it went through the dryer. It still took me about 8-10 subsequent washes using spray 'n' wash on the spot before it was unnoticeable.
Ever since then, I don't go near the darkroom (especially the sink) with good clothes. I have certain things designated as darkroom jeans, shoes, etc...

Thanks guys. So it doesn't sound promising - oh well, that's a lesson I won't forget.

If the previous suggestions don't work just use a good pair of scissors to cut out the stains and create a new photo-based fashion trend!