WOW, my kettle is a glass one and I hate seeing the brown boil marks at the bottom of it, I have tried white vinegar and scrubbing it but it didn't work so good, so I bought this on a whim, I am so pleased I did, I used 30ml of this and 500ml of water and 30 minutes later the kettle is like new! At this price I have ordered another 2 !
My glass kettle have brown oxidisation at the bottom and being able to see it disturbs me. I've tried using vinegar and that didn't work. Followed instructions on Breville Kettle and voila, shinny kettle that pleases me everytime I look at it.
I have a near new kettle but it also had some build up at the bottom and inside the clear measurement window. I used a bit less than recommended. Followed instructions and it's like BRAND NEW again. Whatever is in this product, it works!