My toilet has a buildup of scale. I guess my water has a lot of calcium or something like that. Using bleach makes it look whiter, but the buildup is still there. Commercial toilet cleaners do not seem to remove it. Scraping it with a putty knife works, but it's a big job. What else can I use? I was thinking of some type of acid. I did pour some vinegar in it, but it's so diluted in the water that is dont do anything.
Suggestions?