Customer review from the Amazon Vine Programme (What's this?)
I've used this in a couple of locations in my house: a poorly ventilated corner in a bedroom and in a bathroom. It's pretty effective and in most cases, just one treatment makes light work of removing the stain and the mildew/mould. In just one place I needed to make a second application to get rid of some more stubborn mildew.
It's strong bleach based product, so make sure you have the right clothing, protection and ventilation. A little goes a long way so this bottle is going to last a while.