If your pebble dash exterior is looking tired, streaked with algae, or just plain dirty, you’re not alone. While pebble dash is known for its durability and textured charm, it also tends to trap dirt, moss, and pollutants over time. The good news? You can restore it — safely and effectively — with a method called soft washing.
This guide walks you through everything you need to know about cleaning pebble dash the right way, from what to avoid to a step-by-step soft wash process.
What Is Pebble Dash?
Pebble dash is a type of external wall finish made by throwing small stones (pebbles) onto wet mortar. It became especially popular in the early to mid-20th century for its durability and rustic appearance.
While it’s tough and weather-resistant, the rough texture also makes it a magnet for grime, algae, and airborne dirt. And because of its uneven surface, aggressive cleaning methods can cause serious damage if you’re not careful.
Can You Clean Pebble Dash?
Absolutely — but not with a pressure washer. High-pressure jets can dislodge the pebbles or erode the mortar underneath. Instead, soft washing is the recommended method.
Soft washing uses low-pressure water combined with a biodegradable cleaning solution that breaks down and removes organic growth, dirt, and stains. It’s a safer, longer-lasting solution that won’t damage your walls.
Why Soft Washing Works Best for Pebble Dash
✅ Protects the Surface: No risk of dislodging pebbles or eroding mortar.
✅ Kills Algae and Mould at the Root: The cleaning solution targets biological growth.
✅ Restores Curb Appeal: Makes your home look cleaner and well-maintained.
✅ Delivers Long-Term Results: Helps prevent future buildup.
✅ Eco-Friendly: Uses environmentally safe, biodegradable products.
How to Soft Wash Pebble Dash: Step-by-Step Guide
You don’t need to be a pro to soft wash your walls, but you do need to follow the right steps.
1. Inspect the Surface
Look for loose stones, cracks in the mortar, or areas already crumbling. These should be repaired before you begin cleaning.
2. Gather Your Tools
You’ll need:
- A low-pressure hose or soft wash system
- Soft wash detergent (biodegradable and safe for exteriors)
- Pump sprayer
- Gloves and eye protection
- A stiff (but non-metallic) brush for stubborn patches
3. Rinse Off Loose Debris
Start with a gentle rinse to remove surface dirt, cobwebs, and loose particles.
4. Apply the Cleaning Solution
Spray the detergent across the entire surface, ensuring even coverage. Follow the dilution and dwell time instructions on your product label.
5. Let It Sit
Allow the solution to sit for 10–15 minutes to break down organic matter, but don’t let it dry out.
6. Rinse Thoroughly
Use the low-pressure hose to rinse off all solution and residue. Avoid using a pressure washer.
7. Spot Clean as Needed
For any remaining marks, use a soft brush to gently scrub the area, then rinse again.
DIY vs Professional Soft Washing
Wondering whether to take the DIY route or hire a professional? Here’s what to consider:
| DIY Soft Washing | Professional Soft Washing | |
| Pros | Lower cost, clean on your schedule | Expert results, no equipment needed |
| Cons | Time-consuming, risk of damage | Higher upfront cost |
Tip: For large areas, stubborn algae, or high walls, hiring a professional is often worth the investment.
Common Pebble Dash Cleaning Mistakes to Avoid
❌ Using a pressure washer – Damages mortar and dislodges stones.
❌ Skipping the pre-rinse – Leads to uneven cleaning.
❌ Using harsh chemicals – May stain surfaces or kill nearby plants.
❌ Not rinsing thoroughly – Can leave residue and cause streaks.
How to Maintain Pebble Dash After Cleaning
- Inspect regularly: Check walls annually for signs of grime or organic growth.
- Clean seasonally: Soft wash at least once or twice a year, especially after wet months.
- Trim nearby plants: Reduces moisture buildup and moss growth.
Get a Free Quote for Professional Pebble Dash Cleaning
Ready to refresh your home’s exterior the safe way? Our team specialises in soft washing pebble dash surfaces using eco-friendly, non-damaging methods. Get in touch today!
