try using several denture tablets let stand over night, repeat if necessary, rinse and wash well and rinse again good luck ceealice ... View related article.
I have metal cup with cover to keep tea hot and no matter what I used the stains would`nt budge until I thought of putting 2 denture tablets in and let stand over night, repeat if necessary, you may need several tablets for large pot, good luck..ceealice ... View related article.