Best way to clean an old/stained toilet?

[LivingOnAnIsland]

A few months ago, there was a similar thread and something was recommended - but I can't find the thread now. What's the best product to use? Thanks.

Bleach

This from B&Q.

Leave some overnight and agitate with the big brush.

It will make it like new.

Hi

Thank you for all your suggestions - will try and upload before and after pics!

Borax mixed into paste. Leave on overnight . Rinse

I was going to suggest cheap coke. Hope something does work OP

day 1, bottle of white vinegar or limescale removing toilet cleaner - leave it and don't flush.

Day , flush lots then bleach the fuck out of it. Leave another day then flush a lot again.

Cillet bang anti mould spray it lifts everything.

And, yes, if that doesn't work, get the industrial limescale remover, which is hydrochloric acid based. Don't mess with it.