I clean my sink with ajax every day after washing the dishes, but that doesn't prevent this nasty build up. I have very stubborn Utah hard water. I have tried all of the hard water products out there, saturating my faucets and soaking my fridge tray overnight. All I have gotten from my efforts are deadly fumes from the toxic chemicals in the cleaners. A couple of years ago I learned the cleaning power of VINEGAR. I used it to clean my humidifier because the instructions said to. It took off the hard water like it was nothing! I started using vinegar on my faucets and everything else and it was amazing!!! I now buy vinegar in bulk at Costco and use it for my heavy duty cleaning needs. Vinegar is cheap and non toxic. Here is how to use cheap plain white vinegar to get rid of hard water: For the refrigerator in-door dish: Pop the dish out, pour a little vinegar in it and let it sit for about 20 minutes. I use an old toothbrush and the hard water just wipes off without any scrubbing. To clean faucets: Soak some paper towels in vinegar and placed them on the areas with hard water. Fill a spray bottle filled with vinegar and spray the towels every time you walked past. After about 20 minutes take the towels off and scrub off the hard water with an old toothbrush. For areas with thick hard water, put the towels back on, spray with more vinegar and wait another hour keeping the towels soaked with vinegar. You shouldn't have to scrub really hard, the hard water will off easily after soaking in vinegar. Warning: Do not use vinegar on marble countertops or other stoneware, as it can cause the stone to pit and corrode. You can also use vinegar on shower heads to unclog all of the holes. One of my shower heads detaches from the base and is easily soaked in a bucket. For the other one I have to tie a bag filled with vinegar to it. Update: Since writing this post, I bought a water softener and no longer need to use vinegar to remove hard water. Having a water softener has made cleaning much easier!