I moved to a new house and all 4 toilets had stubborn urine rings. I used this and now they are gone! This works best when you wear down the corner to a more rounded surface as this allows the stone to have more contact with the ring at the same time. The stone is quite soft so it wears out fairly quickly. I'm not sure if it's soft enough to not scratch the bowl or something. It doesn't seem to scratch the bowl, but I don't really plan on sticking my hand in to find out. The only improvement I would suggest is making the handle longer. One of the toilets has the same urine stain, but it's at the bottom of the toilet where the water flushes. When I try to use it there, the pen lands in the water. I could turn off the water and flush the water, but in this particular toilet the shut off valve is not working properly. Until I fix that, it would be nice to have a longer handle. Otherwise very happy with them.
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