It's organic, so I'd try soaking in a biological washing detergent.
Depending on the fabric it'd be an option to use a chlorine bleach, but don't make it too strong a solution, or you'll stain the fabric yellowish.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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