The honest answer for most St. George homes is every two to three months. That is noticeably more often than the twice-a-year advice you will find on national cleaning sites — and the reason is entirely local.
The short answer, by property type
- Most homes: every 2–3 months.
- Homes near unpaved roads or active construction: every 6–8 weeks.
- Homes with sprinkler spray hitting the glass: as often as the rest of the house, plus targeted attention to the affected panes before mineral deposits set.
- Storefronts and street-facing commercial glass: monthly, sometimes biweekly.
- Vacation homes and short-term rentals: before the season and between longer bookings.
- Interior glass only: twice a year is usually enough unless you have pets, small children or a wood stove.
Why St. George is different
Two things drive the schedule here, and neither applies to most of the country.
Red rock dust. The fine iron-rich sediment that gives the landscape its color does not stay on the ground. A single windy afternoon can put a visible film on every west and south-facing window in a neighborhood. It is not gradual accumulation, it is one afternoon.
Hard water. The City of St. George advises softener owners to set their units between 13 and 24 grains per gallon — that is genuinely hard water. When it lands on glass and dries, it leaves mineral deposits that get harder to remove the longer they sit. This is the reason the interval matters more here than elsewhere: waiting is not neutral, it actively makes the next cleaning harder.
Combine them and you get the local failure mode. Dust settles, irrigation wets it, the mixture dries into a bonded film, and by month four you are no longer looking at a cleaning job but at a restoration job.
A seasonal calendar for Washington County
If you would rather work from the calendar than a rolling interval, this maps to how the year actually behaves here.
- Late February to April. Spring wind is the messiest stretch of the year for glass. A clean in early spring, then again after the wind settles, catches the worst of it.
- May to June. Irrigation ramps up and this is when sprinkler spotting starts. Worth checking your heads at the same time.
- July to September. Monsoon storms leave dust-and-rain spotting on glass that was clean the week before. Expect an unscheduled clean in here.
- October to November. The most stable stretch and the best time for a thorough clean if you only do one or two a year. Also the right window before holiday guests.
- December to January. Least buildup. A good time to catch up on interior glass, screens and tracks.
Signs it is time, regardless of the calendar
- Glass looks hazy in low-angle morning or evening light even though it looks fine at midday.
- You can see distinct dots or rings that stay after a wipe.
- Screens have gone visibly grey or brown.
- There is grit in the bottom track when you slide a window.
- You have stopped opening the blinds on a particular window.
That last one is the honest test. People adapt to dirty glass rather than notice it.
Does more frequent cleaning cost more?
Per visit, no — the opposite. A window cleaned eight weeks ago takes less time than one cleaned last year, because there is no bonded film to break down and no mineral deposit needing separate treatment. Recurring schedules are usually priced below one-time visits for exactly that reason.
The expensive scenario is the one where glass goes untouched for two or three years and then needs mineral restoration, which costs several times a routine clean and does not always fully succeed.
Interior versus exterior
They do not need the same schedule. Exterior glass takes the dust and the hard water, so it drives the interval. Interior glass mostly collects cooking film, fingerprints and pet marks, and twice a year handles it for most households.
That said, having both done in the same visit is more efficient than splitting them, since the crew is already set up and the walkthrough covers the whole window rather than one side of it.
Frequently asked questions
How often should windows be cleaned in St. George, Utah? Every two to three months for most homes, because of red rock dust and hard water. Homes near dirt roads or with sprinkler overspray need it more often.
Is twice a year enough for windows in Southern Utah? Rarely. Twice a year is the national guideline and it does not account for our dust or mineral content. Twice a year here usually means permanent mineral deposits within a few seasons.
What time of year is best to clean windows in St. George? October and November are the most stable. Spring is the most necessary, because of wind.
Should I clean windows before or after monsoon season? Both, ideally. Storms leave dust-and-rain spotting, so a clean after the season ends holds much longer than one in the middle of it.
Do commercial storefronts need cleaning more often than homes? Yes. Street-facing glass collects hand marks and road dust daily, and monthly is the common schedule.
Set it and forget it
Rather not deal with it? Cristaluxe Cleaning does window cleaning in St. George and across Washington County, hard-water treatment included. Call or text (435) 500-0929 or request a free quote — first-time customers get 10% off.
