We use 1 part vinegar to 2 parts water once a week for the coffee maker and it works wonderfully. Just be sure to run 2-3 cycles of water afterwards to rinse it out well. :)
Wow! Cheap and easy way to clean up lime. I couldn't believe my eyes when I opened the lid to my kettle. I don't think I let the mixture boil long enough because there was still a slight ring of build up at the top. Only down side is now the kitchen is a little stinky. Time to go light up a candle!