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To keep it perfectly clean, supermarkets sell Woolmix brand product with a eucalyptus base ( Green bottle ) which is for delicate fabrics. Drop some into a small dish add a squirt of water . Take a nail brush dip it into the fluid and scrub away. Dry off with a clean towel …all done…pearly white again! For the stubborn stuff do the same with concentrated Preen solution first then the Woolmix.