By Neelie from Chapel Hill, NC
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Having lived with rust and mineral water for years and tried most of the things stated in this article and more too. I can say the safest one is white vinegar. Pour it into the water (about a cup) but put it in the tank water not the bowl. Let it set for at least 30 minutes and put a couple handfuls of baking soda in the tank water too. Let set about 10 minutes or more if you can. Take your hand on the inside of the tank and just rub the rust scale off. Swish the water good and flush until clear or a couple of times.
If it is real bad just add the vinegar to the tank every day or so and it will dissolve the rust and help with under the ring. After flushing, take your toilet scrubber and put some baking soda on it and scrub. It didn't get that way overnight and probably won't come off in one cleaning. Some of the scrubbing methods will scar the bowl of newer commodes and older ones may still end up with a grey line where the stain was but you usually cannot get that off as the finish was damaged.
I also use pure white vinegar on my shower (fiberglass) and leave it there until the next shower. It keeps the shower clean. I put it in a spray bottle.
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