I have the problem of the water not reaching the front of the toilet - leaving behind anything that was on that part. I've cleaned the rim and there wasn't much calcium carbonate there in the first place. However, feeling all the way around the rim, I found a white dense plastic object where the water comes from the cistern into the bowl. This is loose and too big to pull out downwards. My wife is adamant that she has only ever used the soluble bleach blocks, so what could this be, and how can I remove it (if I SHOULD remove it - it might be meant to be there)?
Can anyone help on this, please?

Any chance of a picture?

What Are the Causes of Black Scum Under the Toilet Rim? | eHow

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Mineral Deposits

• Mineral deposits gather in your toilet bowl over time, especially if your house has hard water. These deposits show as yellow or white in the bowl at first. Over time, the mineral deposits grow larger and can turn different colors. While the mineral deposits themselves won't turn black, they attract other things that coat the deposits in black.
  
  

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You probably cleaned the gunk off the outside of a mineral deposit mass.

How to Unclog Toilet Rim Holes | eHow

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My wife is adamant that she has only ever used the soluble bleach blocks

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What's a :bleach block"? If there;s a plastic object caught in the flush valve between the tank and bowl it must be removed. Back to you, Tom