Short version: in the Lowcountry you should wash your house once a year, treat your roof every couple of years, and hit the driveway and porch once or twice a year, timed around pollen season and hurricane season. Here is the full calendar so you can stop guessing.

Our climate is the problem. Humidity sits high most of the year, we get long stretches of warm rain, and anything in the shade stays damp for days. That is a buffet for algae, mold, and mildew. Add the pollen dump every spring and the salt air near the coast, and a house in Bluffton or Hilton Head gets dirty faster than almost anywhere else in the country. The trick is not to wait until it looks bad. By the time you can see green from the street, the growth has been there for months.

January and February: The Quiet Window

These are the coolest, driest months we get. Pollen has not started, humidity dips, and cleaning solutions work predictably because surfaces are not baking in the sun. This is a great time for house washing and for getting ahead of the spring rush. If your siding went all of last year without a wash, do not wait for April. Do it now and the house goes into pollen season clean, which makes the yellow film easier to rinse off later.

March and April: Pollen Season Damage Control

Every year the pine and oak pollen arrives and coats everything in a fine yellow-green dust. It is not just ugly. Pollen is organic food for mold and algae, so a pollen-coated house that stays damp is a house that turns green by June. A rinse or soft wash in late March or April, after the worst of the drop, knocks the pollen off before it becomes fertilizer. This is also the right time for screened porch cleaning, because the screens trap pollen and hold it against the frames where mildew follows.

  • Rinse or soft wash siding after the heavy pollen drop, usually late March into April
  • Clean screened porches and screen enclosures before mildew takes hold in the frames
  • Check the north and east sides of the house for early green algae growth
  • Clear gutters and downspouts so spring rains do not streak the walls

May through August: Prime Washing Season

Late spring and summer is when most of our house washing and soft washing happens, and for good reason. Growth is at its peak, so a proper soft wash now kills algae and mildew at the root right when they are spreading fastest. Summer is also when driveways and patios get the most use, so a driveway and concrete cleaning makes the whole property look sharp for the months you are actually outside. One caution: do not pressure wash siding in peak heat. Hot surfaces flash-dry detergent before it can work, and high pressure on hot vinyl can leave marks. Soft wash instead.

September and October: The Hurricane Season Reset

After a humid summer, plus whatever storms pushed through, most Lowcountry homes are carrying a film of mildew, salt, and windblown grime. Early fall is the second-best window of the year for a full exterior wash. If you live near the water on Hilton Head or along the May River, the salt air never really stops, and a fall wash removes the residue before it sits on paint and metal all winter. This is also a smart time to look at the roof. If you see black streaks forming, that is gloeocapsa magma, a living algae, and fall is an ideal time for a roof cleaning before winter moisture feeds it.

November and December: Roofs and Concrete

Cooler, drier air makes late fall perfect for roof cleaning and driveway work. Roof treatments dwell better without summer heat cooking them off, and concrete cleaning is faster when surfaces are not at 95 degrees. If you only do one big exterior project in the back half of the year, make it the roof. Black streaks do not go away on their own, they spread.

The One-Page Version

  • House washing: once a year, ideally February through May
  • Roof cleaning: every two to three years, fall and winter are ideal
  • Driveway and concrete cleaning: once a year, twice if you have heavy shade or tree cover
  • Screened porch cleaning: every spring after pollen, plus a fall rinse if you are near the water
  • Decks, fences, and patios: fold them into whichever visit is closest

Follow that schedule and your home never gets to the embarrassing stage. It is cheaper to maintain clean than to rescue filthy, and it is a lot easier on your siding, shingles, and concrete.

Want us to look at your place and tell you exactly what it needs and when? No Games. Just Clean. Call or text Bob at 843-321-9345 for a free quote, and we will build a simple schedule around your home.