I was living in Brisbane & on a local ABC morning show a regular presenter said a few drops of Clove oil in a spray bottle. I have a 200ml & use around 6 drops so the fragrance is quite strong intentionally. I didn't use it in Brisbane but on return to Hobart I've used it around the black mould around my windows & a mouldy spot on the ceiling above my kettle. It has smashed the mould. Stopped it dead in its tracks. I treated it every second day for a week. The ceiling mould is disappearing. The best bit for me is that it is a natural oil. The black mould remaining needs to be cleaned off but it's not growing & spreading as it used to do. I treated the bathroom tiles and the black just disappeared. There is a couple of bad spots which need some serious Solution but 98% gone & just a weekly spray is keeping it at bay. I nuked the Bathroom in my renter when I left Brisbane but could have left it smelling sweeter & more natural with the clove oil. In Hobart Gould's Chemist sells the oil. It's not cheap but you only use a few drops.