Me too! So much of what I learned about getting rid of stains came from you and by trial and error. I don't know much about chemistry, so I don't have great explanations for how or why some of the chemicals work, but I am keeping track of what works together. The problem is sometimes they work, and sometimes they don't, because the combination of what is in the water is always different. I would really be anxious to see if calcium works for purplegirl - that is why this forum is so great, we all learn from each other