Today I spilled some coffee on my white formal shirt. I tried to wash off the portion with water, soaked the part of shirt in milk(crazy isn't it).. But these two options didn't work.
Use a small amount of vinegar to remove the stain.
There are many things you could try :
I would try in this order, the 2 last having some risk of making it worse : a stain that you just can't remove...