I might guess that the fact that the dress has already been washed means that there's been some bonding of the slime proteins to the fabric, no? The addition of heat and detergent may have altered the chemistry of the slime spot.

David Kirsh
Durham, NC

"We can safely abandon the doctrine of the eighties, namely that the rich were not working because they had too little money, the poor because they had much."--J.K. Galbraith

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