Use club soda. Soak stain with club soda before washing

or

1. Mix one teaspoon of a mild ph balanced detergent (a mild non alkaline non bleaching detergent) with a cup of lukewarm water

2. Blot

3. Mix one tablespoon of household ammonia with a half cup of water

4. Blot

5. Repeat step one

6. Sponge with clean water

7. Blot