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Regular Maintenance
Organizing a regular maintenance schedule is a great first step toward keeping your coffee maker in working condition. Try cleaning the coffee maker when you maintain the other appliances in your kitchen. The maintenance that you perform will result in years of fresh-tasting coffee down the road. Many of the maintenance requirements of a regular coffee maker only need to be done once every few months, but to get the best results (meaning pot after pot of great tasting coffee) attend to it each month. Cleaning the machine won't take too long, however the difference that it makes can be significant.
Quick tips such as dusting your coffee maker regularly can make a world of difference. However, using canned air (which you can find at most hardware/office supply stores) once a month will do the best overall job. Canned air will eliminate any dust that might be inside of the maker or on the heating elements. Also, it is a good idea to soak the baskets or metal filters in a solution of hot water and vinegar to help break up any buildup that they've accumulated. Rinse them thoroughly to get rid of any vinegar smell that remains after soaking. Clean the coffee pot and the heating plate underneath it with nonabrasive cleaners or with a solution of vinegar and water (ice, salt, and lemon juice will also work well to clean the inside of the coffee pot, especially if there's any burnt-on coffee in the bottom.)
Lime Scale and Water Deposit Removal
At least once every three months the inside of your coffee maker should be cleaned to remove any lime scale and water deposits that may have built up. Cleaning solution specifically made for coffee makers can be purchased, or you can make your own with a solution of water and vinegar. Run the solution through a standard coffee cycle (or through several cycles if you're worried about a lot of buildup.) Once the cycle has finished, run several cycles of clean water (preferably filtered or distilled) through the coffee maker to remove any remaining deposits or cleaning solution. Make sure the water that comes out no longer smells like vinegar or cleaning solution before using the coffee maker to brew a pot of coffee again.
Another way to reduce the buildup of lime scale and water deposits is by switching to filtered or distilled water to brew your coffee; or purchase a coffee maker with an in-line water filter. If you opt for the water filter, remember that the filter will need to be changed regularly. Again, a bit of a chore, but well worth the effort.