Window Cleaning

Interior vs. Exterior Window Cleaning: What You Actually Need

Most LA homeowners only book exterior cleaning. Here's why interior glass often needs the work more — and how to decide.

March 4, 2026 5 min read

When LA homeowners book window cleaning, they almost always default to exterior-only. It makes sense — the outside is what looks dirty when you pull into the driveway. But after thousands of jobs, we can tell you with confidence: interior glass is often dirtier than exterior, in different ways, and skipping it leaves a lot of value on the table.

What exterior cleaning actually addresses

Exterior glass takes the brunt of LA's environment: dust, pollen, ocean salt, irrigation overspray, bird droppings, and the mineral residue from rain. The dirt is mostly mineral, mostly hard, and often bonded to the surface. Removing it requires the right detergents, hard-water-safe cleaners for stained glass, and the right squeegee technique.

If you only ever do one thing, exterior cleaning is what people see from the street and what protects your glass from long-term mineral damage.

What interior cleaning addresses

Interior glass collects a completely different kind of grime:

Cooking residue (especially if you have an open kitchen near windows)

Pet dander and nose prints on sliders and french doors

Hand prints, particularly with kids in the house

Cigarette and candle film

Dust film from HVAC airflow patterns

Dead bug residue in window tracks and corners

None of this is removed by exterior cleaning. And because interior film is usually translucent rather than opaque, homeowners often don't notice it until it's been there for years and the glass starts to look hazy from the inside, even with the exterior spotless.

The 'half-job problem'

The single most common complaint we hear from new clients: "The last company I hired only did the outside and the windows still looked dirty." That's not a quality issue — it's a scope issue. If interior glass has any film at all, exterior-only cleaning will appear streaky from inside the house, especially in afternoon sun. The dirt that's left is the dirt you see.

When you can safely skip one

Skip interior cleaning if: nobody lives in the home (vacation rental between guests is fine), the windows are in rooms you never enter (unfinished basement, garage), or you've done a thorough DIY interior job recently.

Skip exterior cleaning if: it just rained heavily and you're trying to delay a few weeks (rare in LA), or you live in a high-rise condo where the HOA contracts exterior cleaning separately.

In nearly every other case, doing both at once is significantly better than doing either one alone. It's also more cost-effective per square foot — most cleaners discount the second side.

What to ask for when you book

A complete window cleaning should include: exterior glass washed and squeegee-dried, interior glass washed and squeegee-dried, all sills wiped, all screens removed and rinsed, and tracks vacuumed and wiped. Confirm all five items are included before you book — "window cleaning" can mean very different things depending on the company.

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