Generally, dry-clean is recommended to wash pashmina.
Pashmina should be washed separately.
First dip pashmina into luke warm (20°C) 10-15 litres water for 15 minutes;
Take pashmina out and put in 5-10 litre again in a bucket and put 2-3 spoons of detergent for silk and wool or shampoo. Immerse pashmina for about 30 minutes;
Stir it with your hand gently after 30 minutes or turn it around a few times. Do not wash in machine for cashmere is delicate natural fiber pashmina may shrink and get damaged in machine. Also do not wriing, twist or tumble dry.
Flat dry in shade away from direct sunshine. Steam iron it when it is 90% dry.
Then you wiil get a fresh new pashmina.