Urgent help! Fungus?

[saskdilemma]

I've just went into my nephews bathroom and he's got this on the shower bottom. His parents ( who are foreign) doesn't think it's a big problem. He always has a chest infection or some sort but if it's a fungus or something else... Perhaps it's causing the infections.

My question is what's the best way to get rid of this stuff permanently on a diy basis?

[DameDiazepamTheDramaQueen]

It's mould- HG bleach will get rid of it. Long term you need to dry after every shower and ventilate well.

[skivvywoman]

Yip bleach

[GeorgeTheThird]

Details mould and mildew spray. Any supermarket. Green spray bottle.

[GeorgeTheThird]

Details? Wtf autocorrect! Dettox.

[AuditAngel]

I use the detox spray too

[Sativa]

Does the Dettox really work ? I've tried neat bleach but it has no effect at all as it the mould seems to be inside the sealant.

[P1nkP0ppy]

Strip off the sealant and replace with one that has a mould inhibitor.
Scrub the grouting with bleach and tell them to up the ventilation and heating.

[skivvywoman]

Sativa how long are you leaving bleach on?

[DameDiazepamTheDramaQueen]

Bicarb and bleach mixed into a paste works well too,leave on all day but with window open and door shut as it's strong.

[Sativa]

Sorry for the delay! I've left bleach on for hours skivvywoman.
There's no window in the bathroom so could I still try the paste ?

[GeorgeTheThird]

The Dettox does work, yes. But I've never let mine get as bad as your photos, so I can't say for sure it works on that amount.