Bests & Worsts Reviews from Amazon

I have been searching for a cleaner to get the hard water white scale off our shower doors and shower heads for more years than I care to admit. From CLR, to the green stuff, to Kaboom and vinegar, even barkeepers, I tried everything that promised to remove it. Some worked a little (barkeepers) but most didn't work at all. I saw this citric acid in a review of some other product that the reviewer said did not work. The reviewer said to skip the other product and try this. She called it a "miracle cleaner". OK, I was up for a miracle at this point. I figured it was worth a try. If it didn't work I could always use it to make sourdough bread. It's other name is "sour salt" when used in cooking. I diluted the powder 2 TB per 4 cups warm water as suggested. I poured it into a clean spray bottle. I sprayed the shower door. The white scale melted before my eyes. And I mean MELTED off the door. I rinsed the door with a 2 liter spray bottle (Hudson brand sold on Amazon) and the door was like new! No scrubbing, no nothing. How could this product have escaped my notice all these years? I googled citric acid and saw the many other uses for this product from cleaning the coffee pot, to cleaning tile and windows. The dirty grout in my kitchen...clean! The apple slices got soaked in a light solution before dehydrating.(Cheaper than lemon juice). Anything vinegar or lemon juice can do, this can do better. Enough said. This is exactly the same as "sour salt" in the small container. I also bought this because I am never going to get a decent sourdough starter going. I've tried for several years: the hundreds of different techniques on hundreds of bread websites, the "Alaska dehydrated starter" that I ordered all the way from Utah, the "fresh starter" from some folks that said it was over 100 years old and used on the Oregon Trail no less. Well, it was time for plan Z (the cheaters way). Add 1/4 to 1/2 tsp per dough recipe (about 3 cups flour) and add an extra tablespoon of yeast and you've got sourdough bread! The first time I used it, I didn't add extra yeast. I guess this salt inhibits yeast action. (same thing happened when I tried to make sourdough bread by adding vinegar.) The second time I used it to make rye bread, I added the extra yeast and it turned out perfectly. I have also used it for sweet and sour sauce. Vinegar is still my other sour ingredient in the sauce, but this adds a real kick. Lots of my grandma's "old country Russia" recipes use this sour salt. Cabbage and meatball recipe and many soups. Look on line for great "old country" recipies. Nice company too. They reached out to see if I was happy with their product.