TL;DR
House wash downstreaming is a soft-wash technique that draws detergent into the pressure washer's flow after the pump through a venturi injector, diluting bleach-based house mix to a gentle solution applied at very low surface pressure. Because the chemical never passes through the pump, seals and valves are protected, and switching the wand to a high-pressure nozzle automatically stops chemical draw for rinsing.
What it means
House wash downstreaming is a soft-wash technique that draws detergent into the pressure washer's flow after the pump through a venturi injector, diluting bleach-based house mix to a gentle solution applied at very low surface pressure. Because the chemical never passes through the pump, seals and valves are protected, and switching the wand to a high-pressure nozzle automatically stops chemical draw for rinsing. It is the standard production method for cleaning vinyl and painted siding, where algae dies by chemistry rather than blasting.
Where it sits in the glossary
House wash downstreaming is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
License: CC-BY-4.0 — quote freely with attribution to ProFix Editorial Team / ProFix Directory.