When these, from containing hard water for a considerable time, have become coated in the interior with a deposit of carbonate of lime and other impurities, the easiest way is to use about a teaspoonful of hydrochloric acid, rinsing the bottle with it. It will be found that the instant the acid comes in contact with the deposit it removes it, a clear solution of chloride of calcium being formed. The bottle should then be rinsed in plenty of clean water. After a decanter has held port or other wines for a long period, a deposit of coloring matter will cover the interior surface of the glass This may be easily cleaned off by a little sulphuric acid, in the manner above described.