Black mould/gunk up under toilet bowl rim

[Total loss]

In our new (old) house, when you clean up under the toilet bowl rim some black mould?/gunk comes out. It is not in the cistern above and there is always more the next time it is cleaned. Anybody got a clue as to what it is aand how to get rid ? I've never had it any other toilet before.

[Simpo Two]

Might be slime mould.

Bleach should do it.

[Mobile Chicane]

Bleach as above (squirt it into all the crannies, leave it overnight and scrub), then drop a Parozone cistern block into the cistern.

However the bigger question is why is this mould forming? Got any anywhere else? Is there adequate ventilation?

I'd buy a cheap (ish) weather station which can monitor internal relative humidity and keep an eye on the readings.

Mould will form above 70% RH, and if it's consistently above that, you've a problem somewhere.

[Gingerbread Man]

Mobile Chicane said:

...then drop a Parozone cistern block into the cistern.

Don't do this if you ever need a plumber to do some work with it.

[GTIR]

Try regular squirts of Harpic Power Plus.

Works well and keeps the gunk at bay.

[944fan]

Gingerbread Man said:

Mobile Chicane said:

...then drop a Parozone cistern block into the cistern.

Don't do this if you ever need a plumber to do some work with it.

Why not? Not questioning you but genuinely want to know

[Gingerbread Man]

944fan said:

Why not? Not questioning you but genuinely want to know

Because any work on a toilet cistern - replacing the fill or syphon, is a horrid job if it's got a load of sediment/ gunk at the bottom. Makes the job messy. Nightmare.

[g7jtk]

Yes it's a horrible job but somebodies got to do it

[Total loss]

Thanks for the reply's so far
Done the bleach up under the rim over night- it comes back, I guess it doesn't get into all the nooks and crannies.
Toilet is in the bathroom, no extractor fan, gets steamed up with the shower on, but no mould anywhere else ever.
You can't even see it, until you clean the toilet up under the rim with the brush and all this black gunk comes out, just don't think it should be there.
Bleach in the cistern was what I had thought to do, just thought I would ask the great PH collective first.

[g7jtk]

Clean off what you can with a brush then spray bleach/ cleaner/ drain cleaner up under the rim. A dose of bleach in the cistern from time to time won' hurt either.
A mini steam cleaner would also help.
Speaking as a Plumber I would take the pan out and jetwash it.

[chucklebutty]

HG Mould remover from Amazon/Robert Dyas for convenience. Bleach doesn't kill some types of mould, it merely makes them stronger :-)

[Wings]

Use, spray Spirit of Salts, you will have the cleaness toilet you will have EVER seen, allow for ventilation, window open etc., but NEVER mix any bleach, toilet cleaners with ANOTHER cleaner, chemical.

[944fan]

Gingerbread Man said:

Because any work on a toilet cistern - replacing the fill or syphon, is a horrid job if it's got a load of sediment/ gunk at the bottom. Makes the job messy. Nightmare.

Fair enough. Thanks

[Ray Luxury-Yacht]

I've fitted out a few houses recently, and you'd be amazed how cheap a new toilet unit is from a trade supplier. Like £50 for a basic white bog.

Simple swap for someone remotely in posession of some common sense. Two pipes - the cistern pipe 'in' and the waste outlet. Swap the seat over (or replace with a new one) and you have a nice, new, gunk-free unit. Then start using some bleach tablets in the cistern from now on and the problem will never return.

That's what I'd do!

Had a quick Google for you - here's one from Screwfix for instance, which includes the cistern too - £59.