High-rise passengers judge a building by the elevator cabin in the first 10 seconds. A fingerprint-covered door can undo a $1 M lobby renovation. Below is Google Stainless-Steel’s field-tested 3-minute routine that leaves #4 brushed surfaces spotless and LEED-IEQ compliant.
Cloth: 300 gsm split micro-fibre, 80 % polyester / 20 % polyamide—lifts oil instead of smearing.
Spray: pH 8–9, zero chloride, zero ammonia; 5 % plant-based surfactant lifts finger-print sebum in 5 s.
Dosage: 2 spritzes per 0.5 m²—enough to damp, not drip, avoiding water marks behind the panel.
GIF: slow-motion wipe along vertical grain of #4 brushed 316L panel (10 Mb, autoplay muted)
Fold cloth into quarters; use one side per door.
Start top-left, wipe downward in 30 cm strokes—never circles.
Flip cloth; buff once horizontally on return stroke to even reflectance.
Total elapsed: 45 s per 2 m door.
Test strip dip: if chloride > 60 ppm, dilute with 50 % de-ionised water.
Hard-water cities (Miami, Dubai) use 1 g food-grade citric acid per 500 ml to chelate Ca/Mg—prevents white haze.
Never use bleach wipes; chloride residue > 200 ppm initiates pitting within 30 days.
For cabins > 1 000 users/day, specify factory-applied 50 nm SiO₂ clear coat:
Contact angle 105° (lotus effect).
Cleaning interval stretches from daily to twice/week.
Coat lifetime 5 years; recoat on site with UV-cure pen in 20 min.
| Cleaning Method | 60° GU Day 0 | Day 30 | % Loss |
|---|---|---|---|
| Micro-fibre + pH 8 spray | 42 | 40 | 4.8 % |
| Ammonia glass cleaner | 42 | 34 | 19 % |
Try the chemistry: Claim a FREE 100 ml pH-neutral elevator spray + 2 premium micro-fibre cloths—shipped globally in 48 hours, carbon-neutral.
</body> </html>
