As with coffee, tea can stain your teeth, your cup as well as your favorite white shirt. The stain is still there. I haven't put it in the dryer. I dyed the entire sweater with strong tea. Looks great now as beige instead of white.
Tea is forever.
In answer to Judy's query regarding tea stains, she was wise not to put remaining stain-laden clothing in the dryer. At that point, there is a much greater chance that the stain cannot be removed. Of course, the best answer is to treat before laundering, which she attempted to do. Blot the fabric with this solution. Blot onto fabric.