How effective is vinegar as a stain remover for removing tough stains?

Vinegar can be effective as a stain remover for some tough stains, particularly those caused by substances like coffee or wine. Its acidic properties can help break down and lift the stain from the fabric. However, it may not be as effective on all types of stains, such as grease or oil-based stains. It is always recommended to test a small, inconspicuous area first before using vinegar on a larger stain.