If you’ve noticed green streaks creeping up your siding or dark blotches on the north side of your house, you’re not imagining it. Baton Rouge’s heat and humidity make mildew, algae, and mold grow faster here than in almost any other part of the country. That’s why “how often should I pressure wash my house” is one of the most common questions we hear from local homeowners — and the honest answer depends on your home.
The general rule: once a year
For most homes in the Baton Rouge area, a full exterior wash once a year keeps mildew from taking hold and protects your paint and siding. Late spring or early summer is ideal, before the worst of the humidity settles in and after pollen season winds down.
When you need it more often
Some homes need attention twice a year. You’re in that group if:
- Your house sits under heavy tree cover or stays shaded (less sun means slower drying and more algae).
- You’re near the river, a bayou, or a pond, where moisture lingers.
- You already see green or black streaks returning within a few months of cleaning.
- You have light-colored siding, where growth shows quickly.
Driveways, patios, and north-facing walls almost always get dirty faster than the rest of the house, so those often get a mid-year touch-up even when the whole house doesn’t.
Why not just let it go?
Beyond looks, mildew and algae hold moisture against your siding and can shorten the life of your paint. Left long enough, that growth works into cracks and seams. A yearly wash is far cheaper than repainting or replacing siding — and it keeps your home looking cared-for, which matters if you’re thinking about selling.
Pressure washing vs. soft washing
One important note: not every surface should take high pressure. Vinyl siding, wood, and especially roofs can be damaged by a too-aggressive spray. For those, a soft wash — lower pressure with a cleaning solution that kills the growth at the root — is safer and lasts longer. A good local pressure washing pro will know which method your home needs, which is the main reason we don’t recommend renting a machine and guessing.
Get a free quote
At Red Stick, we clean homes across Baton Rouge and the surrounding areas — Prairieville, Zachary, Denham Springs, Gonzales, and Central. We’re licensed, insured, and local, and we’ll tell you honestly whether your home needs a wash now or can wait. If those streaks are bugging you, request a free, no-pressure quote and we’ll take a look.