We Remove Mold, Algae & Grime from Siding On Long Island

We Remove Mold, Algae & Grime from Siding On Long Island

Restore the Beauty of Your Home with Siding Cleaning in Suffolk County

Request A Free Estimate

Helping Suffolk County Homeowners Fall In Love With Their Homes Again

We get it. It starts as a few green spots. Then some black streaks. Before you know it, your once-beautiful home looks weathered, stained, and a little… forgotten.


Whether it’s algae, mold, or just years of buildup, dirty siding doesn’t just affect your curb appeal — it affects how you feel about your home.


At K.O.S. Cleaning, we understand how hard it is to keep up with exterior maintenance — especially on Long Island’s unpredictable weather.


That’s why we’re here. We make siding cleaning easy, safe, and satisfying.


Why Your Neighbors Choose K.O.S. for Siding Cleaning:

  • We don’t judge — we just clean. Whether your siding hasn’t been cleaned in years or you’re prepping for a big event, we treat every home like our own.
  • Stains don’t stand a chance. Algae, mold, mildew, grime — gone. Our soft washing process gently but thoroughly removes it all without damaging your siding.
  • You’ll love the way your home looks again. We can’t count how many times customers tell us, “I didn’t realize how dirty it was until I saw the results!”
  • We’re local, and we care. Based in Bohemia, we proudly serve all of Suffolk County. We’ve been cleaning Long Island homes since 2006 — and it still brings us joy every single time.


Ready for that “WOW” moment?

Get your free estimate today and let’s bring your siding back to life. Whether you’re in Patchogue, Smithtown, Ronkonkoma, or anywhere across Suffolk County, we’re just a call or click away.

Prevent Costly Siding Damage

Maintaining your home’s siding, and keeping it free of mold, dirt, mildew, moss, and algae is crucial in preventing damage to your home. Keeping your siding consistently clean will drastically extend its life, and durability.


Our expert siding cleaning can prevent those unsightly problems from ever occurring. You’ll be amazed at the results and  the extraordinary effect clean siding has on your homes curb appeal.


Don't let dirty siding detract from the beauty and value of your property. Trust KOS Cleaning of Long Island to keep your siding looking its best year-round.


Contact us today to schedule your siding cleaning service and experience the difference our expertise can make!

Your Home Deserves to Shine

Serving All of Suffolk County & Beyond:

There’s nothing worse than feeling embarrassed by how your home looks — especially when you’ve worked so hard to take care of it. We’re here to take that weight off your shoulders.


Our siding cleaning service is fast, affordable, and completely safe for vinyl, wood, and cedar siding. No harsh pressure. No hidden fees. Just honest, professional service from a team who truly wants to help.

We’re based in Bohemia and proudly service homes throughout:

  • Sayville
  • Ronkonkoma
  • Patchogue
  • Bay Shore
  • Smithtown
  • East Hampton
  • Montauk
  • Port Jefferson
  • And surrounding Long Island towns


Not sure if you’re in our area? Just ask — we’re happy to travel!

House Siding Cleaning Long Island

We're Cedar Siding Cleaning Pros

We offer expert low pressure washing to remove mold, mildew, dirt & grime with no risk of damage to cedar shakes. Our low pressure soft wash process will not strip paint or stain.

Schedule An Estimate

Top Rated Cleaning Experts

We guarantee  the most thorough cleaning ever, all with zero hidden fees"

FAQ'S About Siding Washing

  • What are those green and black streaks on my siding?

    They’re usually algae or mold — both common in Long Island’s climate. They grow in damp, shady areas and can make siding look older than it is.

  • Is it safe to clean siding with pressure washing?

    Traditional pressure washing can be too harsh. We use a soft wash method that’s safe and effective — no damage, just results.

  • Can you clean cedar or wood siding too?

    Yes! We clean all types of siding, including cedar shake, vinyl, and more — safely and thoroughly.

  • Will this help increase curb appeal?

    Absolutely. Clean siding makes a huge difference in how your home looks — and how people feel when they see it (including you!).

  • How long does it take?

    Most homes are cleaned in just a few hours. We’ll schedule a time that works best for you, and you’ll see instant results.

Schedule Your Free Estimate 

Tell Us About Your Cleaning Needs

a man is spraying water on the roof of a house .