Hello. I can assist you with your question.
There are a few different things you can do.
The baking soda is a good suggestion, but there is a method to it. While vinegar is and acid (acetic acid), baking soda is a base.
When combined the chemical product of mixing the two is carbon dioxide and water.
Here is the proper way to apply it.Baking Soda Poultice
There are other ways, including some that are "quicker", but this is the safest.
You should always do a spot test first.
If the procedure provides any progress at all, then you know it's working and can repeat it until the stains are gone.
Are you with me?