Generally speaking Fruit stains can be removed by simply rinsing the item immediately in cold water then wash in a biological detergent that contains bleach.
Having said that fruit stains can be troublesome, so have a go at the following if the stain is rather more persistent: Sprinkle some salt on the stained area. The salt will absorb some of the stain. If the stain is dry then dampen before sprinkling the salt. Wash in warm water with liquid detergent, preferably biodegradable. If the stain persists, try applying a little hydrogen peroxide, or borax.
