The
best way to clean stains from crockery teapots, cups bottom of plates etc is
bleach. Always wear rubber gloves and either pour direct into teapot, cup, then pour
bleach onto a sponge and clean outside of item (remembering the inside of handles) or if the crockery is dishwasher and microwave proof, you should be able to fill your sink with hot water and
bleach and leave the dishes to soak for 30 mins. make sure you rinse thoroughly and any smell has gone.