If you've ever looked at the north side of your house and noticed it's gone a little green, you already know South Texas is hard on a home's exterior. So how often should you actually wash it?
The short answer for most Rio Grande Valley homes is once a year. But the Valley isn't most places, and a few local factors can push that to every six to nine months. Here's how to think about it.
Three things gang up on RGV homes. First, the heat and humidity create a perfect environment for algae and mildew, especially on shaded, north-facing walls that never fully dry out. Second, our hard water — pushed onto walls by sprinkler systems — leaves chalky mineral deposits and orange rust streaks. Third, the fine caliche dust and road film that blows in from open land and busy roads settles into a dull gray haze over everything.
Left alone, that buildup doesn't just look bad. Algae and mildew actually feed on organic material in paint and finishes, so the longer you wait, the more they spread — and the harder (and more expensive) they get to remove.
You don't need a calendar to know it's time. Watch for these:
Some homes need it more often than others. You're likely on the shorter end of the schedule if your home has heavy tree cover and shade, sits near open fields or active construction, has a lot of north-facing wall, or has light-colored stucco that shows every streak — common in the newer subdivisions around Edinburg and North McAllen.
One important note: a house should be soft washed, not blasted with a pressure washer. High pressure can drive water behind siding and strip paint. Soft washing uses low pressure plus a cleaning solution that kills algae and mildew at the root, so it stays cleaner longer. We get into the details in our guide on soft washing vs. pressure washing.
It's tempting to put off a house wash, but the buildup isn't just cosmetic. Algae and mildew hold moisture against your siding and trim, which over time can contribute to rot on wood elements and premature failure of paint. Hard-water mineral and rust staining etches deeper the longer it sits. In other words, a modest wash today can save you from far more expensive repairs and repainting down the road. Regular cleaning is genuinely a form of maintenance, not just curb appeal.
If you like a routine, here's an easy one for South Texas. Do your main house wash in late spring, before the most humid stretch of summer, so algae doesn't get a foothold during its peak growing season. Then do a quick visual check in the fall. Homes with heavy shade or near dust and open fields may want a lighter touch-up between the two. Pairing your house wash with gutter cleaning or a driveway cleaning in the same visit saves a trip and usually a little money.
Plenty of RGV subdivisions — especially newer ones in Edinburg and North McAllen — have appearance standards in their rules, and a streaky, algae-covered exterior can earn you a letter. A yearly soft wash keeps you comfortably ahead of any complaints and keeps the whole street looking better. If your HOA has already flagged your home, a professional wash is usually the fastest way to resolve it.
For most Valley homeowners, a yearly soft wash keeps the exterior looking sharp and protects your paint and finishes. If your home is shaded, near dust, or already showing streaks, plan on a little more often. The best time is usually heading into our hotter, more humid months, before algae has a chance to take hold.
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