This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
Keep the metal work well polished; rub it frequently with a clean chamois skin.
Cleansing pastes for bright metal parts: We have already given formulas in Part III. in "Maintaining of Apparatus". There will be also found a formula for silvering metals, which may be usefully applied to metal parts of dispensing apparatus; before application clean the parts bright and dry and remove all grease by application of weak lye.
A saturated solution of hyposulphite of sodium will clean even oxydized silver-ware in a short time. Dissolve of the salt in one pint of water as much as it will take. Moisten a rag or brush with the solution, and apply to the object to be cleaned.