Mould behind toilet - would a dehumidifier help?!

[doingitbythebookthistime]

As the title says, we have a small gap between our toilet and the wall in our windowless bathroom. I have just noticed a mass amount of black mould that has grown behind the toilet!

Utterly freaked out 😩. We have a good extractor fan but obviously no window. Would a dehumidifier help this issue do you think?

If so would a 10ltr be big enough?

TIA

What could be causing it is condensation forming on the outside of the toilet cistern / pipework - cold water enters the pipes/cistern when the toilet is flushed then condensation forms and mold grows.

Check there's no leaks? That would be the best solution in a way as it could be fixed then no more water for mold growth

A dehumidifier might help. Opening windows and adequate heating are also the obvious suggestions

There is always condensation on our toilet after we've had showers so that would make sense! Definitely no leak.

We don't have a window, and we have our heating on and off throughout the day (is programmed to come on if it drops below 17). I'm not really sure what more we could do?

Not sure if there's a way we could have the radiator in the bathroom on at all times without heating up the rest of the home?

What a nightmare

Yes, it would certainly make a difference. I have a 12L for my 2-bed house, so 10L would be fine for one room. How big is your house / flat? I'd be tempted to get one large enough to cover the whole property to make sure that damp from the bathroom isn't affecting anywhere else. Do you have condensation issues?

When you clean the mould, wear a mask as it can be dangerous. Cillit Bang black mould remover is good, or diluted bleach.

Oh perfect I think I'll order it then! Our flat is 711 sqft and we don't have damp/condensation issues anywhere else (thank god)

I've attempted to clean it but the gap between the wall and toilet is teeny tiny! I've sprayed down the gap and put clothes at the bottom, but I know it needs a good scrub!

Wonder if there is a way to loosen the toilet from the wall (probably not but I'm desperate to get rid of it 😩)

I'd be wary of moving the toilet (but I have zero plumbing skills!). Can you improvise with a radiator cleaning brush? Or perhaps a spatula with a cloth wrapped around it? Is the mold dry at any point? If so some of it might come away if you use a small attachment to a vacuum cleaner? Some tips here:

https://www.goodhousekeeping.com/home/cleaning/g3728/how-to-clean-hard-to-reach-spots/