Roof Washing in NJ

Over time, roofs naturally develop dark streaks, stains, and buildup that take away from your home's appearance. In areas like Cranford and throughout Union County, this is often caused by algae, moss, lichen, and dirt that thrive in humid conditions and shaded areas. A lot of homeowners are surprised to find out that while it may seem like just a cosmetic issue, this buildup can actually shorten the lifespan of your roof if left untreated.

Our roof washing service safely removes these contaminants using a soft washing method designed specifically for delicate roofing materials. Unlike traditional pressure washing, which can damage shingles and strip away protective granules, soft washing uses low pressure combined with specialized cleaning solutions to break down and eliminate organic growth at the source. We have more information on the differences between power vs. soft washing on our Exterior Home Care Tips page.

What's Growing on Your Roof and Why You Should Care

Those black streaks you see are typically caused by algae (commonly known as Gloeocapsa magma) which feeds on the materials in your shingles. Over time, this growth spreads and traps moisture, creating the perfect environment for moss and lichen to develop as well.

This is where the tricky part comes in! If left untreated, roof algae and organic buildup can lead to:

  • Premature roof aging and shingle deterioration

  • Trapped moisture and potential structural damage

  • Reduced curb appeal and home value

  • Higher long-term maintenance and repair costs

So while regular roof washing does give your home an automatic curb appeal boost, it more importantly helps protect your home. Two birds, one stone.

Our Roof Washing Process

The key word here is low-pressure soft washing. This lets us thoroughly clean your roof and eliminate growth at the root all while avoiding any damage to your shingles or gutters. 

1. Inspection We assess your roof for algae, moss, lichen, and general buildup, and check the overall condition. We treat every home differently  because we want to fully understand what's really going on up there before we do anything.

2. Preparation Homeowners work hard on their gardens and flowers! So we take extra care to protect surrounding landscaping and make sure everything is safe before we begin.

3. Soft Wash Treatment A specialized cleaning solution is applied to break down algae and organic growth at the source. And don't worry! No harsh chemicals here. Our solutions are effective without being aggressive on your roofing materials.

4. Gentle Rinse The roof is rinsed at low pressure to remove residue and leave things clean. This works so well because our cleaning solution already did the hard work, which is why high pressure is never needed.

5. Final Walkthrough We do a thorough final check to make sure everything is evenly cleaned and your property is left looking refreshed. If you notice something we didn't, just let us know!

Why Homeowners Trust Otterly Clean

Roof cleaning isn’t something you want rushed or done aggressively. We take a careful, low-pressure approach and treat your roof like it’s our own—making sure it’s cleaned safely and evenly from start to finish.

Feeling overwhelmed trying to find good, reliable help? We get it. Here's what you can always count on with us:

  • Clear, upfront communication from start to finish

  • Careful attention to detail on every surface we clean

  • Safe, proven soft washing methods that protect your roof

  • Treating every home like it's our own because in a way, it is

Why Roof Washing Is Worth It

A professional roof washing does more than improve how your home looks. It protects one of the most valuable parts of your property. Removing algae, moss, and buildup early can meaningfully extend your roof's lifespan and help you avoid costly repairs down the line.

Many homeowners are honestly surprised at how big of a difference a proper roof cleaning makes. It's one of the quickest ways to boost curb appeal without a major renovation. It is also one of the smartest ways to protect what's already there.

Here is a quick list of which surfaces are ideal for roof washing

  • Asphalt shingles

  • Architectural shingles

  • Cedar shake

  • Tile 

  • Metal roofing

Roof Washing FAQs

  1. How often should I have my roof washed? For most homes in New Jersey, a roof washing every 2–3 years is a good baseline. Homes with heavy tree coverage or significant shade may need it more frequently since those conditions accelerate algae and moss growth.

  2. Is soft washing safe for asphalt shingles? Yes! Soft washing is actually the recommended method for asphalt shingles. High-pressure washing can strip the protective granules off your shingles and even void manufacturer warranties. Soft washing cleans thoroughly without any of that risk.

  3. Will roof washing remove all the black streaks?In most cases, yes! Black streaks caused by Gloeocapsa magma algae respond well to soft wash treatment. Heavily embedded staining or lichen may require a follow-up treatment but we'll always let you know upfront after our initial inspection. No hidden surprises here!

  4. How is roof washing different from pressure washing? Pressure washing uses high-force water to blast away surface dirt. This is great for concrete and hardscapes, but too aggressive for roofing materials. Roof washing uses low pressure and specialized cleaning solutions to treat and remove organic growth safely without the risk of damage. With roof cleaning, you want the cleaning solutions to do the bulk of the work. 

  5. How long does a roof washing take? Most residential roof washings are completed in 1–3 hours depending on roof size and the extent of the buildup. We'll give you a realistic time estimate when we provide your quote. 

  6. Do I need to be home during the roof washing? Nope! As long as we have access to the property and a water source, we're good to go. Most of our customers are at work by the time we're done.

  7. What do I need to do to prepare? Honestly? Not much. We handle all the prep including protecting your landscaping. Just make sure we have clear access to the property and move any outdoor furniture near the roofline if you can. That's it!

Get a Free Roof Washing Quote

If your roof is showing dark streaks, green patches, or visible buildup, roof washing is likely all it needs.

Text a photo. Get a free quote. Always.

Text/Call (908) 913- 0358

Email: info@otterlycleanco.com

Service Areas

We proudly serve homeowners and businesses across Union, Essex, and Morris Counties including Cranford, Westfield, Scotch Plains, Fanwood, Summit, Mountainside, New Providence, Berkeley Heights, Springfield, Clark, Garwood, Kenilworth, Millburn, Short Hills, Maplewood, South Orange, Livingston, Madison, Chatham, Florham Park, and Morris Plains. Don’t see your town? Reach out anyway — we’d love to help.