To remove curry sauce stains, blot the stain with a cloth dampened with benzene or methylated spirits.
You can also use warmed glycerine to penetrate the stain. Remember to rinse the treated area with warm water after.
Ammonia diluted with a little water can also be effective.
When using chemicals, always read the notice : it may be necessary to wear special gloves, goggles and or a mask to protect yourself.