How to Safely Soft Wash Vinyl Siding
In This Article
The Dangers of High Pressure on Vinyl
Vinyl siding is one of the most popular cladding materials because it is low-maintenance and weather-resistant. However, it has one major weakness: it is not waterproof, but rather "weather-resistant." It is designed to overlap and breathe.
If you spray high pressure beneath the siding seams - especially spraying upwards - water will become trapped against the wood sheathing. This causes extensive, hidden rot and mold behind the walls, which can destroy the structural integrity of your home without you knowing it until it's too late.
Additionally, pressure washers can easily crack vinyl panels, especially in colder weather or if the vinyl is old and brittle. The force of the water can also drive water into windows and doors, causing interior leaks.
The Soft Wash Method
The solution is "Soft Washing." This method relies on chemistry, not physics.
Our soft wash method applies a specialized cleaning mix (detergent + sodium hypochlorite) to dissolve algae and dirt. After allowing the solution to dwell (sit) for 5-10 minutes, the siding is rinsed with a volume of water no stronger than a rain storm.
The secret is in the dwell time. The chemicals do the work, breaking down the biological growth at the root, rather than just blasting the surface clean.
Performing the Oxidation Test
Before washing, professional technicians check for oxidation. Vinyl siding is exposed to intense UV rays, which can cause the surface to oxidize - creating a chalky, faded residue.
If you wash oxidized vinyl siding with a strong detergent or high pressure without proper preparation, you risk leaving permanent streaks and blotches. Specialized oxidation removers or restoration soaps are required to prep the surface before the main wash.
The Correct Mix Ratios
Not all cleaning solutions are created equal. A typical professional vinyl mix involves a very low concentration of sodium hypochlorite (often 1% or less) combined with a surfactant (soap) to help it cling to the vertical surface.
Why low concentration? Too strong a mix will strip the UV inhibitors from the vinyl, causing it to fade prematurely. It can also leave a "tide mark" or residue on the panels.
Post-Wash Inspection
After the wash, professionals don't just pack up and leave. We inspect the siding for damage that might have occurred over the years, such as:
- Loose panels
- Cracked caulk
- Faded or chalky patches
Common Mistakes to Avoid
When it comes to vinyl siding, homeowners often make these critical errors:
- Using a Fan Tip: A 0-degree nozzle is a recipe for disaster, creating lines of damage. Always use a wide fan tip.
- Ignoring the Soffits: Don't forget to clean the underside of the eaves! They get just as dirty and mildewed.
- Using Bleach Straight: Never use household bleach full strength. It will kill your landscaping and leave streaks.