I haven't used it for tea specifically, but I've been really impressed with "Grandma's Secret Spot Remover". I've removed old blood and ink from fabrics with it so far - no stains left behind and no bleaching (one item was a bright cherry red polo shirt - no sign of the ink left and no pale spot either). It's pretty inexpensive - I've bought it from Amazon and also found it on the "impulse item" shelf at my LQS cash register.