Could white vineger lighten skin?
Vinegar and Skin
It might but it would take awhile and be quite stinky! any acid that is applied topically has the potential to lighten skin by increasing exfoliation and epidermal skin cell turn over, however, some are better than other and some are safer! kojic acid or licorice extracts are 'natural' remedies that have been found to help lighten skin.
Retinoic acid is another good one. Hope this helps!