Andrew shared: "Hydrogen peroxide is also a good way to kill mould. You can apply it directly to mouldy tile grout and let it sit, then scrub and rinse. If you're in the mood for a science ...
However, if your grout is flaking and breaking, or tiles start to come off, you'll need to bite the bullet and replace it. It's best to do this as soon as possible to avoid water damage to your walls.
Zep recommends application to grout lines only, so I tried my best not to get it on the rest of the tile. I could immediately see the solution bubbling up on the extra dirty areas, which indicated ...