
bought a house with a concrete pool 15 years ago and inherited a problem with limescale deposits on the dark blue tiles behind a waterfall. I've been fighting it ever since. Used many "guaranteed" products to solve the problem with no results. Use a chisel and toothpick to pry off the debris. Many hours but never solved. I reluctantly bought this product and although it took a few uses and a bit of cleaning with a 3M pad, the problem is finally solved. If the deposits are very thick, scrape them off first as shown in the video. If it's thin, just apply it, rub it a little and it will happen. Very satisfied after 15 years!

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