[Roxeth]

I have some very stubborn marks in the bottom of v/enamel toilet bowl. scrubbing with a brush has not moved them. Is there a bio digester that will eat them?

[BeeClean]

if you cant remove them with a toilet brush then they are likely to be limescale marks which you will need to deal with using an acid based descaler. once you get rid of them try cleaning regularly with a descaler rather than bleach. this is not an ususual problem for many people in hard water areas  

[steve_tyler]

vindaloo makes a mess of everything dont it

[spirit]

Best bet is to get some Ho5 (act) ad force water round bend with toilet brush and apply ho5 with brush, the thick gel will stick, leave for half and hour and agitate at water level and on stain, flush and flush again... stain may need retreating but this will get rid of water mark and other nasty evil sludge that lurks in these places.

Good luck,
H

[petra]

I find STC or acid wash work well, obviously with protective clothing.
Peta

[The Great One]

I use a toilet descaler and usually it gets rid of it in 1 application.

although I just had a real minger and it took 4 applications!!!

1 of them I left on overnight, must of been there for months...

regards

Martin