Hope this helps a bit
An estate pipe stem which on reciept I washed with toothbrush, warm water and sanitised with deniclean and buffed up with Savenelli stem polish. Then smoked.
Today I suspended it in half a jam jar of water and dropped in a denture tablet. Four hours later I tooked it out ran it under the tap and left it.
Above is the result. Hope this helps.
Owen