This is the most amazing product I have ever used. And …they haven’t paid me a cent to say this!! I’m simply a very, very happy and amazed client. I bought it because of their claims on “easy oven cleaning” and yes..that was the easiest way I’ve ever cleaned my oven …. That then caused me to try my copper stained toilet bowls and I’ve tried everything to clean those copper stains (including citric acid and CLR) …..and YES …KOH also fixed that problem …. I’m a complete convert now …. I then bought their pack which included the diamond sponges ….OMG ….the combination is amazing …. It’s promoted a spring clean …..painted walls …windows…. Ceiling fans ….. just to see it’s effect. I don’t know what’s in it but it’s excellent AND it doesn’t hurt your skin or your ‘nose’ … Highly recommended - 5 Stars ⭐️ ⭐️ ⭐️ ⭐️ ⭐️ Do yourself a favour