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A fourth a cup of white vinegar in a spray bottle filled the rest of the way with water is great for a quick clean up for coffee makers. Just spray and rinse. It is cheaper than using window cleaner and since I use my coffee maker for both making coffee and brewing tea daily. I like that it does a good job on removing their respective smells.
Also, spray it in the bottom of glasses with a milk ring and let it sit for a few minutes. You won't have to scrub it.
Source: God gets the credit for this inspiration.
By Ann from Saint Peters, MO
When I clean my coffee maker with vinegar, I do it in the bathroom. When the vinegar has run through, I put baking soda in the tub drain and pour the hot vinegar in. I quickly close the drain so the vinegar and soda can work its magic! Then when I run the water through the coffee maker to finish the cleaning, I pour that hot water down the drain to further clean the drain too.
So simple but works so well at keeping my bathroom drains from getting clogged!
By Betsy A. 
I rejuvenated a garage-sale coffeemaker with denture cleaner tablets. I dropped several tablets in a cup of very hot water and used an old toothbrush and many q-tips to clean the inside of the lid, the filter holder, and as much of the reservoir as I could reach. The denture solution also worked on the exterior of the machine, including around the heating ring and beneath the filter holder. I also used denture cleaner on the carafe. I dumped the remaining solution into the reservoir, added a few more tablets and enough hot water to fill the tank, and let it sit overnight. The next day I ran the coffee maker with the denture cleaner solution in it, followed by two tanks of water. Then I did a tank of vinegar to decalcify and to flush out any sediment leftover from the denture solution, followed by two pots of clean water. Then I made a delicious pot of coffee.
Denture cleaner is great on coffee-stained mugs and counters. Probably dentures, too.
Cleaning your drip coffee maker is important to keep bacteria from growing and it will ensure that your coffee tastes good. Vinegar is a safe, natural way to clean and disinfect your coffee maker. Try this method every 2-4 weeks:
If you have a coffee pot that has old or burned coffee residue, take about 5 or 6 pennies and 2 tablespoons vinegar. Swish it around the pot until stains are gone. The vinegar acts as the cleaner and the pennies are the abrasion to remove the stains.
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Here are questions related to Cleaning a Drip Coffee Maker.
Is there any good way to clean a coffee-maker, besides vinegar? I have used this and it no longer works.
By Louise B. 08/20/2010
If vinegar no longer works, lemon juice won't either. They are about the same acidity. Baking soda is not going to get rid of the shale buildup. Wrong chemical reaction for that. I would suggest that you try full strength vinegar in the coffee pot. If the thing isn't working, this isn't going to make it any worse. You may just have a particularly heavy build up of lime. I am assuming that you use about a 1/3 vinegar, 2/3 water mix to clean, as that is what I am supposed to use in my machine. If full strength vinegar doesn't work, and try it a couple of times through, try CLR. That is an even stronger acid.
I found this site that has many home-made remedies for cleaning.
Baking soda is another natural, non-toxic cleaning ingredient that does wonders for cleaning a coffeepot among other things. Baking soda is a natural abrasive so it can be used to scrub off stubborn stains and residue similar to the way you'd use Comet or Ajax scrubbing powder.
Sprinkle a bit of baking soda on and around the inside of your coffeepot, then moisten it with water and scrub lightly with a clean moist cloth. Add more baking soda and water as needed until the stains are gone, then rinse thoroughly with clear water.
Lemon juice is a natural source of citric acid, and that is also a non-toxic cleaning and disinfecting substance that's easy to use for cleaning a coffeepot. Add a few tablespoons of pure lemon juice to a coffeepot filled with water, then pour that into the coffeemaker reservoir and run the brewing cycle without any coffee grounds in the basket. Run a second brew cycle with plain water to rinse the system fully before using it to make coffee again.
How do I clean my stained Hamilton Beach coffee maker?
Gene from Lake Wales, FL
By Stephanie (Guest Post)02/09/2008
After a lot of research and trying everything everyone has said -- I finally tried a MR. CLEAN MAGIC ERASER and it works! And easier than any other method suggested.
What is the best way to clean a coffee pot?
Joe from Dyersburg, TN
By beanygurl 09/08/2006
I clean the pot itself with baking soda and water. I put the other parts thru the dishwasher and we clean the coffee maker with vinegar and water.
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Fill reservoir with 1 pint (473mL) white vinegar and enough extra water to fill the reservoir. Turn on Coffee Maker. Let it brew 1 cup of water/vinegar solution, then turn off coffee maker. Let it stand for 1/2 hour, then turn coffee maker back on. When finished brewing, rinse pot, then fill reservoir with water and let it brew the hot water. I usually do this twice. Better than commercial coffee maker cleaners.
What is the proper way to clean a stovetop coffee maker? I believe that it is recommended to simply rinse it with hot water everytime after you use it and let it dry so that the coffee maker gets conditioned by the coffee? The reason I'm asking is that I used to do this all along, but it seems that my coffee maker is getting some black stuff build up on the bottom that looks like mold.
Zonester from Vancouver