Struggling with mold on your exterior walls? As someone prone to asthma, I avoid harsh chemicals indoors and stick to natural cleaners. But for tough outdoor mold, I've found a reliable, effective solution using bleach—no scrubbing required.
This method, which costs less than €2, is the most effective I've tested for mold removal without elbow grease. Here's how it works:
- Bleach
- Tap water
- 1 spray bottle
1. Pour 8-10 cm of bleach into the spray bottle (about 60 cl bleach to 1 liter water).
2. Fill the rest with water.
3. Spray generously on the mold.
4. Let it sit—no scrubbing needed.
5. Repeat until the mold is gone.
Mold stains vanish easily from exterior walls. I used this on our terrace railing after moving in—the previous owners had neglected it, leading to heavy buildup.
Typically, 1-2 sprays suffice, but here it took about a week of 3-4 daily applications. Here's the progress, all without rubbing:
After first application:
After second:
After third—noticeable improvement:
The railing returned to its shiny chrome finish after the fourth. 
You can scrub and rinse right after spraying if preferred, but letting bleach penetrate works wonders, especially in hard-to-reach spots. It kills residue and prevents regrowth.
- Wear a filter or disposable mask and safety glasses.
- If mold returns, a quick spray or two handles it.
- Spray vertical surfaces top to bottom.
- Use old clothes—they may stain.
- Remove inexpensive jewelry; bleach can tarnish it.
- Face away from the wind to avoid splashes.
- Use at least 60 cl bleach per liter—better to overdo it.
- Rinse treated areas around children and pets, as bleach can be hazardous.
- Bathtub joints: Click here.
- Mildew on fabric: Click here.
- Washing machine mold: Click here.
