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We used soft washing to get it all out. That means low pressure combined with a cleaning solution that actually kills the algae at the root rather than just blasting the surface. High pressure on vinyl siding can force water behind the panels or cause cracking - soft washing avoids all of that while doing a better job on biological growth like algae and mold.
The difference once it was done was exactly what you'd hope for. The yellow siding looked clean and bright again. The white trim around the windows and corners popped the way it should. A house like this - well-landscaped, classic colonial style - really does look sharp when the exterior is clean.
Here's the thing most homeowners don't think about: algae isn't just ugly. Left alone, it holds moisture against the siding and can cause long-term damage. Getting it removed regularly is basic maintenance, not just a cosmetic fix. A good house washing every year or two goes a long way toward protecting what you've got.