Lay out a clean white rag on a solid surface. Place the stained viscose fabric on top of the rag.
Dip a white rag in acetone. Blot the stain with the rag.
Rinse the stained fabric with clean water. Reapply acetone, then rinse again until no more nail polish is removed when the acetone is applied.
Spray or rub a prewash stain remover to the stain.
Wash the viscose fabric in a washing machine. Dry as directed by the fabric manufacturer.