Hi Dean
It is very hard to remove stains after they have been washed and dried, but you can try these solutions.
You can try some hairspray, just douse the area well and rub hard with a bar of soap then wash.
Another method is to blot the area with a little
ISOPROPANOL alcohol. (From Chemist)
Or you can dab with baking soda and lemon juice.
One of them should work