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The use of Hypo alongside pressure washing.
- dean jones
- 6 days ago
- 4 min read
Pressure washing is a powerful way to clean driveways, patios, and other outdoor surfaces. When combined with the right chemicals, it can remove stubborn stains, algae, and dirt more effectively. One chemical that stands out for its cleaning power is sodium hypochlorite, commonly known as hypo. This post explains the benefits of using hypo with pressure washing, how temperature affects its performance, and when and how to apply it safely. If you live in the West Midlands, including Walsall, Cannock, Sutton Coldfield, or Wolverhampton, DMS offers free hypo treatment and re-sanding with every driveway clean.
What is sodium hypochlorite and why use it?
Sodium hypochlorite is a strong disinfectant and bleaching agent. It is widely used in cleaning because it breaks down organic matter like algae, moss, and mould. When used alongside pressure washing, hypo helps loosen dirt and remove organic stains that water alone cannot remove.
Benefits of using hypo with pressure washing:
Improved stain removal: Hypo targets tough stains such as oil, grease, and organic growth.
Disinfection: It kills bacteria, fungi, and algae, reducing/preventing fast regrowth.
Time-saving: It reduces the need for repeated washing passes.
For driveway cleaning, hypo is especially useful on block paving and concrete where moss and algae thrive in damp conditions.
How temperature affects hypo’s effectiveness
Temperature plays a key role in how well sodium hypochlorite works. Hypo solutions are more active at warmer temperatures but degrade quickly in heat or sunlight.
Ideal temperature range: Between 15°C and 30°C (59°F to 86°F) is best for applying hypo.
Cold weather: Below 10°C (50°F), hypo’s cleaning power slows down, making it less effective.
Hot weather: Above 30°C, hypo breaks down faster, reducing contact time with stains.
Sunlight exposure: UV rays degrade hypo quickly, so re apply to areas or apply early morning/late afternoon.
At DMS, we monitor weather conditions to apply hypo when it will perform best, ensuring a thorough clean.
When to use hypo in pressure washing
Not every cleaning job requires hypo. It works best in these situations:
Algae and moss growth: Hypo kills and removes green or black algae on driveways.
Oil and grease stains: It can help to break down stubborn vehicle oil marks. ( used alongside dedicated products like Synergy from pure seal )
Mould and mildew: Hypo disinfects and removes fungal growth.
Discoloured surfaces: It brightens surfaces stained by organic matter or pollution.
Avoid using hypo on delicate surfaces like on some natural stone or painted areas, as it can cause damage or bleaching. Always do a test patch if unsure of type of surface.
How to use hypo safely and effectively
Using sodium hypochlorite requires care to protect surfaces, plants, and people. Follow these steps for best results:
Dilute properly: Use a solution of 3-5% hypo mixed with water. Stronger concentrations can damage surfaces so increase strength gradually.
Test a small area: Before full application, test on a hidden spot to check for adverse effects.
Apply with a X-jet, pump sprayer or brush & bucket: to evenly coat the surface. Agitate with a stiff brush after 5-10min.
Let it sit: Allow the hypo to work for 30 minutes but do not let it dry out.
Pressure wash: Rinse thoroughly with a pressure washer, using appropriate pressure to avoid damage.
Protect plants and pets: Cover nearby plants and keep pets away during application.
Wear protective gear: The use of correct mask, gloves and eye protection is essential when handling hypo.
At DMS, we include free hypo treatment with every driveway clean, applying it safely and rinsing thoroughly. We also offer re-sanding to restore the look and stability of block paving after cleaning.
Why choose DMS for your driveway cleaning
DMS serves Walsall, Cannock, Sutton Coldfield, Wolverhampton, and surrounding West Midlands areas. We combine pressure washing with expert hypo treatment to deliver deep cleaning results that last.
Free hypo treatment with every clean to remove algae and stains.
Re-sanding included to keep block paving secure and looking fresh.
Experienced local company using the right pressure and chemicals for each surface.
Flexible scheduling.
Commitment to protecting your garden and property.
Other chemical treatments: We have a variety of chemical treatments in our arsenal to tackle a wide variety of stains professionally and safely.
FINAL NOTE: The use of chemical treatments may not be needed for every clean. A good, professional driveway clean using professional equipment can sometimes be all that's required for outstanding results.
With over 20 years experience, DMS has provided professional driveway cleaning, pressure washing, exterior cleaning & pitched roof repairs across Walsall, Cannock, Sutton Coldfield, Wolverhampton and surrounding areas in the West Midlands. Local, Trusted and Established. Visit our website for more info, or have a look at our google reviews.
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