cleaning door knob how to do?

according us Take a bowl and measure in one tablespoon of flour, one of salt, and one of vinegar. Mix it thoroughly until it turns to a paste, and then rub it on to the surface of the brass or copper. We now sell the microfibre cloths which you use. Leave it for a couple of minutes, and then wash it off with hot soapy water. Clean your door hardware Gently wipe the surface of your door hardware with the mild soap and water mixture. Using water only, wipe surfaces again to remove any detergent left behind. Immediately dry all surfaces with a clean towel. Do not spray or immerse the hardware in liquid at any time.