That's Not Dust, Mate

Someone posted photos online recently of a jacket pulled from their closet after a few months. Dusty white bloom all over the shoulders. Same on their shoes. They were renting a basement, doing everything right, Swiffering the hardwood weekly, and couldn’t work out why everything kept getting this fine coating on it. Asked the internet what was going on.

The internet, in its collective wisdom, arrived at the same answer about four hundred times: mate, that’s not dust. That’s mould.

What followed was a genuinely fascinating thread. People explaining the difference between dust and mildew growth patterns (dust is “poofy”, apparently, mould is flat and patchy and grows on vertical surfaces in a way gravity-fed dust just doesn’t). People throwing out humidity targets like they were swapping footy tips, 40-50%, no higher than 55, get it under 30 if you can. Someone recommending DampRid bags. Someone else recommending an ozone machine and a fairly alarming multi-step vinegar-and-Lysol ritual that sounded like an exorcism. And underneath all of it, the same grim refrain: this is your landlord’s problem, not yours.

I don’t know anything about basement apartments in whatever US city this was, but I know a fair bit about damp Melbourne rentals, because I lived in a few of them in my twenties before I could afford better. Weatherboard place in Frankston with a bathroom that never fully dried out. Black spots creeping along the grout no matter how often I bleached it. I didn’t have a name for it back then beyond “gross,” and I definitely didn’t have the vocabulary this thread had, humidity percentages, remediation companies, egress requirements. I just lived with it and complained to a landlord who did nothing, because what was I going to do, this was 2001 and I had no idea tenants had rights worth mentioning.

That’s the bit of this thread that stuck with me more than the mould itself. How many people jumped straight to “talk to your landlord, this is on them” and “look up your tenancy rights.” Genuinely good advice, and it’s advice that assumes a landlord who’ll act on it, or a rental market where you’ve got somewhere else to go if they don’t. The original poster said moving wasn’t an option, they’d be paying double or triple elsewhere. That’s not a mould problem anymore. That’s a housing market problem wearing a mould costume.

We’ve got our own version of this conversation here. Anyone renting in Melbourne’s outer suburbs over the last few years has watched what used to be a negotiation turn into something closer to an auction. Mould, damp, dodgy heating, you raise it, and there’s a queue of people behind you who won’t. Renters’ rights have genuinely improved on paper in Victoria, minimum standards, restrictions on rent increases, but paper rights are only as good as your willingness and ability to use them when you’re worried about being the difficult tenant who gets quietly not-renewed.

The health stuff in that thread was interesting too, because it swung between genuine expertise and pure fear-mongering, sometimes in the same comment chain. Someone citing actual respiratory research, immediately followed by someone insisting they’d photographed spores directly attacking their nervous system, or something equally unhinged. That tension is real though: some mould is genuinely dangerous, some is just gross and manageable with better airflow, and figuring out which is which from a phone photo is basically impossible. I don’t know which category that basement was in. Neither did most of the people confidently telling him otherwise.

What I do know is a dehumidifier is cheap insurance and a closed window in a Melbourne winter is basically a mould incubator, whatever hemisphere you’re renting in. Crack a window when it’s dry out. Don’t store things in sealed dark spaces without airflow. And if you’re renting and something’s growing on your jacket that shouldn’t be, get it in writing to your landlord sooner rather than later, because “I told them verbally in March” doesn’t hold up anywhere near as well as an email does.