If your coffee maker has suffered from long use, misuse or disuse, a freshening up may be in order. Common household bleach, when used properly, can be an effective and inexpensive way to clean your coffee maker. But be warned, that not all parts of your coffee maker are suitable for cleaning with bleach.
Remove the carafe (the glass coffee container) from the coffee maker. Empty any coffee out of it. Take the carafe to a well-ventilated room, or outside. Pour bleach into the carafe, and allow it to sit for 30 minutes to one hour.
After the bleach has soaked in the carafe for 30 minutes to an hour, pour the bleach out down the drain slowly rinsing with plenty of water. Fill the carafe with water and rinse it at least three to four times.
Wash the carafe with common dishwashing detergent after you have completed the clear water rinses.
Mix a solution of one part bleach to six parts water. Put on rubber gloves, and dip an old sponge into the solution. Wipe the exterior of the coffee maker, paying careful attention to spots that have stained from coffee exposure.
Wipe down the exterior with a sponge or clean dishrag soaked in water. Allow to dry, then wipe down again with water and a sponge.