The New Leader Of The Opposition Party/
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For more on marking an answer as the "Best Answer", please visit our FAQ.Bio washing powders contain active enzymes which 'digest' organic stains, such as those from food. These stains contain proteins which can be hard to shift. For example in our bodies a particular enzyme may digest a protein in tomatoes, so that very enzyme can be put in bio washing powder to be effective against tomato ketchup stains.
I can't think of a reason why a top couldn't be washed with bio powder, but I guess there must be one and I should think its due to the enzymes, maybe there's some delicate natural fibres in it - wool and other animal hair are also proteins after all and i guess could be damaged by the enzymes.
I doubt it has been ruined, just use non-bio next time.