limescale in toilet bowl???

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Hi. Not sure if this is limescale but the bottom of my loo, where the water is is all rough to touch and discoloured. Have tried scooping all the water out and spraying with lime lite, bleaching, coke, you name it! I cant decide though if the actual enamal in there has worn away of if it is limescale. Any ideas how I can get rid of this as it's getting worse over time. Thanks

ther is someblack stuff you can buy domestos somehting

That domestos stuff in the black box as coddy mentions is very good. Tis tablets, you put them down and leave them for 20 mins....done!

Domestos Zero Limescale. I got it in a toilet duck-type bottle though. But be warned, my SIL used it in her sink and it ruined it, completely took the shine off.