Overview
- Plan the job for temperatures around or just above freezing and avoid deep cold, with risk thresholds cited near minus 5°C to minus 10°C.
- Use lukewarm—not hot—water to avoid thermal shock that can cause cracks in the glass.
- Add diluted denatured alcohol or windshield antifreeze to the cleaning mix to prevent icing, keeping it off frames and seals because it is caustic.
- Dry panes, frames and gaskets thoroughly with a squeegee and lint‑free cloth to prevent refreezing, stains and stuck seals.
- If the mercury drops toward minus 10°C or below, limit cleaning to the interior or wait for a milder day, and work in sections so water does not freeze on large panes.