E.E.
Use a black or dark colored bib when you give it to her. Or just let her sit naked in her diaper when you give it to her. There is really no good way to get it out. Oxyclean baby seemed to help some but only if you spray it right away and even then it still stays somewhat. Also try aiming the dropper toward the inside of her cheek so it doesn't hit her tongue and she tastes it less. Or mix it in with some formula.