Like I did, on my holiday recently; a big brown stain on my favorite jeans as the Iodine bottle broke inside my suitcase.

2 tablespoons of borax in the washing machine fixed it. Together with washing powder and some Oxypowder . All gone!
Same works for stains on furniture and carpets.

On skin; vit C / ascorbic acid takes care of it within seconds. But dont use vit C on fabrics or furniture, it takes it away, yepp; but after a few hours it may get a yellow stain as the vit c oxidizes.