Recently purchased a home I'd like to rent.?

If you tried cleansers and it's still there, then it's probably water/mineral stains. A pumice stone will do the trick, or let it go since it must be hard to see anyway.

Use pumice stone to clean those calcium deposits or any other stains. I got rid of a lot of toilet rings using this product. Just physically rub it on the area and the deposit disappears. And you dont have to worry about nasty smelling chemicals. You can follow up with monthly applications of white vinegar to keep everything sparkling.

Put a dry detergent TIDE is best in a spray bottle and spray the area for a few days toaweek. Leave the sprayed water on the mess and gradually it will break down to where you can scrub it off.

Spray bleach cleaner. Every time you use the toilet, spray it really, really good.. until you see a good change.. Eventually with a bit of rubbing. it should start to look much cleaner. Every time! you use it.

Use a Pumice Stone. You can buy one at any pool supply and Lowes and Home Depot sells them.

It is more likely mineral buildup from hard water. you can try CLR or get some pumice stones and scrub them off.

Are you sure that isn't some sort of hard water deposit or a stain? You might try a product like CLR and see if that eats away at it.

Nasty stuff like that comes out with muriatic acid really well. Muriatic is what masons use when they clean up their stone work - and it's sold at the stone yard. If you're a landlord, you might want to get a gallon of this stuff for really miserable cleaning jobs.

Suddenly toilets and sinks are really White! You have to put some in the toilet and stop breathing in there for a bit - it's a strong acid. But it's just hydrochloric acid.

The only downside to it is that if you use very much, it will instantly rust any iron stuff around it. But I've used it on absolutely hopeless looking toilets and sinks and tubs.

You could try a pumice stone.