Interior vs Exterior Window Cleaning

What interior cleaning removes, and how

Interior glass collects a specific and fairly predictable set of soils: fingerprints and handprints around doors and partitions, a fine film from HVAC circulation and general dust, product residue where cleaning staff have used the wrong spray, and marks from furniture and foot traffic at the low edges.

The method is unglamorous and effective: apply solution with a scrubber or applicator, pull it off with a squeegee in an overlapping pattern, and detail the edges with microfiber. It is done standing on the floor or a short ladder, which means no specialist access equipment and no fall-protection planning, and it is why interior work is straightforward to fold into a nightly cleaning program. The scope is on our window cleaning page.

What exterior cleaning removes, and how

Outside, the soil is environmental: airborne dust and pollution, rain spotting and hard-water staining, road spray and winter salt at street level, pollen in spring, bird droppings, and cobwebs in frames and corners. It accumulates faster and is more visible in direct light.

Method depends entirely on height. At ground level and just above, exterior glass is cleaned the same way as interior, by hand from the ground or a short ladder. Above that, exterior specialists use water-fed pole systems, which run purified water up a telescoping pole to a brush head so the glass can be scrubbed and rinsed from the ground with no ladder and no detergent residue. Higher still, the work moves to rope descent or powered lifts, performed by crews trained and equipped specifically for it. Those are distinct trades with their own insurance and safety programs.

How often each side needs doing

A reasonable starting cadence, adjusted at the walkthrough:

• Storefront and ground-floor glass: monthly, and often every two weeks on a busy corridor. This is the glass that carries the brand, and it is the fastest to look neglected.
• Exterior office glass: quarterly is the common baseline, semi-annually for sheltered elevations.
• Interior glass: monthly to quarterly, following occupancy and traffic rather than weather.
• Entrance doors and lobby glass: spot-cleaned daily. Fingerprints on a door reappear within hours, which is porter work rather than a window visit; see day porter services.

The two sides drift apart on purpose. Interior frequency follows how many people touch the glass; exterior frequency follows the weather and the street.

Frames, sills, and tracks

Clean glass sitting in a dirty frame still reads as a dirty window. Sills collect grit, dead insects, and standing water; tracks pack with debris until the window or door binds; frames hold the dirt line that the eye actually notices.

These should be named explicitly in the scope, because plenty of window quotes cover glass only and leave the rest. Detailing frames, sills, and tracks on the same visit is what makes the difference visible from across the room. On storefronts the same logic extends to what sits above the glass, which is covered by awning and signage cleaning.

Seasons in the metro area

The calendar shapes exterior glass here more than most people plan for. Spring brings pollen that turns a clean pane yellow-green within days, which is why a late-spring exterior clean often outperforms an early one. Summer adds dust and storm spotting. Fall is the most stable window and the best time for a thorough exterior pass. Winter brings salt spray and road grime at street level, and freezing temperatures that stop exterior glass work entirely.

Retail and client-facing space usually front-loads the schedule around its own calendar instead, cleaning ahead of peak selling periods and events regardless of season; see luxury retail and retail and storefronts.

Where the scope line sits

Anvil cleans interior glass on every floor, including partitions, interior doors, and office glass, and exterior glass at reachable height, meaning storefronts, entrances, and ground and low-level panes worked from the ground or a short ladder. Frames, sills, and tracks are included on the same visit.

Exterior glass above that height is outside our scope. Where a building needs it, we say so up front, point you to a rope or lift specialist who does that work properly, and coordinate the schedule so the two passes line up rather than colliding. Questions worth asking any window vendor: exactly what height their scope ends at, who does the rest, whether frames and sills are included, and whether their certificate of insurance names your building as additional insured. Anvil carries $2MM general liability with excess/umbrella coverage above it and issues certificates within 48 hours; the detail is on our insurance and compliance page, or send us the building details.

Frequently asked questions

Coverage area

Anvil cleans interior and reachable exterior glass across Manhattan and the boroughs, Westchester, Long Island, and New Jersey, alongside the nightly program where one exists.