Cleaning: Mineral deposits in potty

[Manonash]

I have a potty that has a layer of black deposits in the very bottom where the brush doesn't reach very well. I think they are mineral deposits, but it's driving me crazy. What's the easiest way to get rid of this, and prevent it from happening again? I would prefer a way to do this that is non-toxic. I'm chemically sensitive, too, so I can't handle strong smells. If toxic, chemically stuff is my only option, I could let DH do it though.

Thanks!
Shonda

[proudmomof4]

I've had this in our house back in Germany. One day when I was feeling courageous I simply dug in there (rubber gloves) - most of it came of just using my hands, the rest with a blade or short screwdriver. (Fear not - it's not that yucky, basically just calcium.)
I put in some vinegar concentrate afterwards. Depending on your water, you'll probably have some build-up again in those hard to reach areas but when you use vinegar regularly it'll take longer and it'll be less.

[Manonash]

Thanks -- I'll probably give this a go in the near future. I have no idea how this happened as we have pretty soft water. And, strangely, the other potties in the house do not have it.