I have had numerous scrubs at it, used a number of proprietary cleaners on it but nothing seems to shift it.
I was looking through a book called Express House Cleaning and it reckoned that denture tablets were the way to go. Not having any of them in the house I moved onto the next suggestion and Voila - it worked!
Here's what I did...
Its almost too easy for words... I dumped a big handful of Bi-carb into the bottom of the loo after everyone had left the house for the day, gave it a bit of a scrub, added a big slash of white vinegar and went to work.
When I got home I gave it another scrub and a flush - and it was more or less gone! A couple of treatments and I have a shiny white loo - inside and out!
No fumes, no bleach and no fuss!
I think the trick is the amount of time you can leave it. The longer the better. Overnight didn't work for me - we have too many nocturnal loo users as it turns out!!
Green-ness: Good Green Cleaning! Bi-carb is the poster product of green cleaning!
Frugal-ness: At a $1.67 for 500g - I reckon its a bargain
Time cost: 30 seconds to pop the Bi-carb in and 8 hours to do its thing.
Skill level: Easy Peasy!
Fun -ness: A sparkling loo is more of a novelty than fun at the moment!