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The next step is to fill the toilet bowl with distilled vinegar. After soaking some paper towels in vinegar, set them around the toilet bowl's edge and press them firmly into place. Remove the paper towels first thing in the morning after letting the vinegar and paper towels lie all night. After that, before you flush, use a toilet brush to clean the bowl. You may need to try again if the hard water stains persist. Watch the video down below to see this technique in action!