Clean equiptment is critical to the coffee brewing process. Without good clean equiptment your coffee will not turn out well. If your coffee pot is hazy, then you should soak it overnight in soapy water. The rest of the machine should also be as clear of any dirt or grime. All too often an oily resen can build up in the components that come into contact with the coffee.
I know it may sound rediculous and common sense, but a lot of the time these components get dirty over time and the coffee buildup is un-noticable.