How to get rid of that tough toilet bowl ring Pumie Scouring Stick $1.88 @ Walmart After seeing this on pinterest, I tried it personally. We have hard water build up in our toilets and we have tried everything organically possible. We have even tried chemical cleaners with no luck. This Pumie Scouring Stick rocks!!! It was so easy and our toilets look like new again.
I have found that Zep acidic bowl cleaner, available at Home Depot (and probably Lowe's) will clean just about any stain on a toilet bowl. For extra tough stains, I have painted the cleaner directly on the stain with an old paintbrush after dipping some of the water out so as to expose the bowl stains at the waterline. Let it sit for a while, then scrub with the brush. Works like magic