Very effective
This is a product that was highly recommended by my daughter. Although there was a serious "glitch" in receiving my order, once it arrived and she showed me how to use it, I find it quite satisfactory. It is not "thick and clinging" like some toilet bowl cleaners I have used, but if one leaves it in the water for awhile before scrubbing and flushing, it certainly does a good job of removing the crusted "ring" from hard water. It is also very effective at deodorizing, and can be used to wipe hard-water crust from sinks and tubs as well. A caution: the product contains muriatic acid, which should be handled with care.
Rating: 5 stars