Got an HOA Letter About Mildew on Your Siding? What to Do Next

If your HOA sent a letter about mildew or algae on your siding, find the compliance deadline, book a soft wash before that date, and keep before and after photos plus your receipt as proof. Green and black growth on siding is a cleaning problem, not a repair problem, and it usually clears in a single visit.

Don’t panic, but don’t set it aside

Siding growth is a routine HOA notice in the Lowcountry, and it’s rarely a sign of neglect. Warm, humid air off the marsh and the rivers keeps siding damp for long stretches, and shaded walls stay damp the longest. Algae and mildew grow wherever moisture sits, so even a well-kept home can turn green on its north side between cleanings.

That’s the good news. The less pleasant part is that these letters come with a clock. If the date passes without action, many associations move to a second notice or a formal violation. Your own HOA’s documents spell out what happens next, so treat the first letter as the easiest stage to resolve.

Step 1: Read the letter closely

Before you call anyone, pull out four details from the notice:

• The deadline. Look for a specific date or a number of days from the letter date. Write the actual calendar date down.
• What they flagged. Siding only, or also the driveway, walkway, fence or trim. Some letters list several items.
• Which side of the house. If they name the front elevation or a specific wall, that’s where the inspector will look first.
• How to show you’ve fixed it. Some HOAs want a photo emailed to the manager. Others re-inspect on their own. Some ask you to reply in a portal.

If any of this is unclear, email the management company and ask. A short written question also creates a record that you responded promptly, which helps if you need a few extra days.

Step 2: Book early, not on the last weekend

A few days of rain can push outdoor appointments back, so waiting until the final week leaves you no cushion. Call as soon as the letter arrives and tell us your deadline. Mention every item on the letter so the quote covers all of it at once.

This is also where not needing to be home matters. You don’t need to be home for most exterior jobs, so you can be at work, out of town or busy inside on cleaning day.

Step 3: Use the right method for the growth

Green and black growth on siding is living organic material. Blasting it with high pressure removes the visible layer but often leaves roots behind, so it comes back fast. High pressure can also force water behind vinyl siding, etch soft wood, and strip paint or caulk.

The standard fix for siding is a soft wash. A soft wash uses a cleaning solution applied at low pressure, followed by a gentle rinse. The solution kills the mildew and algae rather than just knocking off the surface layer, which is why the result lasts longer than a pressure-only wash.

Hard surfaces are different. Concrete driveways, sidewalks and pool decks can handle more pressure, and that’s where pressure washing belongs.

If you’re not sure which surfaces need what, describe the letter when you call and we’ll walk you through it.

Step 4: Protect your plants and your neighbors’ goodwill

Before you book any exterior cleaning, ask the company how they protect landscaping and control runoff. It’s a fair question, and a confident answer is a good sign.

Close your windows on cleaning day and move anything fragile off the porch.

Step 5: Document completion for the HOA

Once the job is done, build a simple file you can send to the management company:

1. Before photos. Take them yourself before cleaning day, from the same angle the inspector will see, usually from the street.
2. After photos. Same angles, same distance, ideally in daylight.
3. Your receipt or invoice. It shows the date of service and what was cleaned.
4. A short email. Reference the notice, list what was cleaned and the date, and attach the photos and receipt.

Save a copy of everything. If the HOA re-inspects and has a question, you’ll have it ready. If the company you hired missed a spot, call them back. When we miss a spot, we come back and fix it, so your proof photos match what the inspector sees.

Step 6: Keep the next letter from coming

Siding growth returns over time, especially on shaded walls and near trees. A regular house wash keeps you ahead of HOA inspections instead of reacting to them. A few small habits help between cleanings:

• Trim shrubs and branches back from the siding so walls dry faster.
• Point sprinkler heads away from the house.
• Clean gutters so overflow doesn’t soak the same wall after every storm.

If you want a sense of timing, our post on when to pressure wash your house covers seasons and scheduling.

FAQ

How fast can I get my siding cleaned after an HOA notice? It depends on the weather and the schedule at the time, so call as soon as the letter arrives and tell us your deadline. Booking early also leaves room if rain pushes the appointment.

Will pressure washing remove mildew from vinyl siding? High pressure can strip off the visible growth, but it often leaves the roots and can force water behind the panels. A soft wash uses a cleaning solution at low pressure that kills the growth, so it stays clean longer and the siding isn’t damaged.

Do I need to be home for the cleaning? No. You don’t need to be home for most exterior jobs. Take your own before photos ahead of time and your after photos once the job is done, so you have what your HOA needs.

What should I send my HOA to prove the work is done? Send before and after photos taken from the street, a copy of your receipt with the service date, and a short note referencing the original notice. Check your letter in case your HOA wants it sent a specific way, such as through a portal.

Get it handled before the deadline

If an HOA letter just landed on your counter, we can take it from here. You’ll get upfront pricing before any work starts, you don’t need to be home, and if we miss a spot we’ll come back and fix it. Call (843) 471-0799 or request a quote online and tell us your deadline.