How UV and Sun Exposure Affect Your Windows in San Clemente
San Clemente gets roughly 310 sunny days a year, which is part of why people love it here — and part of why west- and south-facing glass takes a beating most inland homes never deal with.
Why West- and South-Facing Glass Struggles Most
Afternoon sun hitting west-facing windows directly is one of the reasons glare and heat buildup are worse on that side of a house — and it’s also the side where cleaning solution or rinse water dries fastest, which is exactly the setup for streaking. See Why Do My Windows Still Streak After I Clean Them? for more on why direct sun during a cleaning is its own problem, separate from the exposure issue this post covers.
Sun and Hard Water Make a Worse Combination Than Either Alone
Hard water spots and salt residue that would otherwise sit on the glass and eventually rinse off in the next cleaning bake on faster and harder under direct, sustained sun — the moisture evaporates before it has a chance to be wiped away, leaving mineral deposits more concentrated in the same spot each time. Over enough cycles, that repeated baking-on is what pushes ordinary hard water spotting toward permanent etching. See What Removes Hard Water Stains From Windows? for what’s still fixable and what isn’t.
What This Means for Sun-Facing Glass
Homes with a lot of west- or south-facing glass — especially ocean-view rooms designed to catch the afternoon light — generally do better on a slightly shorter cleaning interval than shadier, north-facing rooms, for the same reason coastal-facing glass near the water needs more frequent attention: whatever’s on the glass has less time to become a bigger problem.
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