Streak-free glass, done the proper way
Exterior windows washed with a detergent scrub and a purified water finish — no spots, no streaks, no residue left behind to dry cloudy in the sun.
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How exterior window washing is done properly
Streaky glass almost always comes down to what's in the water and what's left behind after it dries — not how hard anyone scrubs.
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Frames, sills and tracks first
Loose dirt, cobwebs, and grit sitting in the frame or window track get cleared out before any water touches the glass. Skipping this step just means that grit gets dragged across the pane during the wash — a common cause of fresh scratches on glass.
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A detergent wash to lift grime
The glass is worked over with a soft brush head fed through a pole system, with a wash solution chemically injected into the water line to help break down grease, traffic film, and stuck-on dirt like bugs and sap that plain water alone won't shift.
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A rinse with regular water
Once the surface has been scrubbed, a rinse with regular water clears off the bulk of the loosened dirt and detergent, leaving the glass ready for the final pass.
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A finishing rinse with purified water
The last pass uses purified water — water that's had its minerals stripped out, so it dries completely clear with no spots or streaks, and no squeegee or wiping needed. This is the step that actually determines the finish: dry naturally, spot-free.
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A final check in good light
Once dry, each pane gets checked from an angle in natural light — the angle streaks and missed spots actually show up at, rather than a straight-on look from a few feet back.
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Frames and sills wiped down
A final wipe of the frames, sills, and any glass splash-back keeps the finished job looking sharp all the way round, not just on the pane itself.
Not sure if this checks out? Ask an AI.
Copy the prompt below and paste it into ChatGPT, Claude, Gemini, or whichever AI engine you use — it'll independently sanity-check whether this process is a sound way to wash exterior windows.
Get your windows priced
Window washing is priced on callout rather than a fixed rate — flag it in the instant quote tool or send your details directly and James will get back to you with a price.
Priced on callout — no fixed rate, but flagging it in the instant quote tool lets James see it alongside anything else you need done.