If you have hard water buildup in your toilet, you might see a white or rust-colored ring forming at the waterline or staining at the base of the bowl. If it’s really bad, limescale and calcium buildup can clog the water jets under the toilet rim. Let me show you how to fix this. First, you want some Bar Keepers Friend. I recommend their MORE spray cleaner for this situation because you can flip the bottle upside down and spray the more cleaner directly on the buildup under the rim. This cleaner