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How to Clean an Asphalt Roof Safely & Effectively
a Step-by-Step Guide

Welcome to Wash Safe™ Industries. In this step-by-step guide, we're going to teach you how to clean asphalt roof shingles safely and effectively using our original eco-safe Roof Wash and cleaning method. With 13+ years of experience cleaning over 2,500 roofs, we've engineered both technique and formulations to rid properties of pesky, ugly stains from moss, mold, lichen and algae while preventing them from coming back without bleach or harmful chemicals. You can also download and print by clicking the quick link below.

Frequently asked questions and answers are also provided to help guide you along the roof cleaning process.


How can I tell if there is moss, mold, algae or lichen growing on my roof?

Look like this? It's probable this..
how to clean moss off your roof

Roof Moss

Often bright green in color, Roof moss looks like Mother Nature's carpeting on your roof. It has a dense texture and usually grows in dense clumps in shady location on your roof. Roof moss will cause shingles to fail prematurely if it grows underneath them.

Roof Lichen

Roof lichen, seen here in a light green color, grows in bush-like, leafy structures. Lichen clusters can be small or large. The texture can be dry, and crusty which can make it extremely difficult to remove. A low pressure wash pressure washing will remove it.

Roof Algae

Blue-green algae and algae are some of the most common pests that grow on roofs. It looks like a thin film (green, black or white) or shading on the roof, as shown in photo. Its appearance gives the impression of an all-over stained or discolored roof.

Roof Mold

Black roof mold is one of the most problematic pests, when it comes to health concerns. Black roof mold will show in streaks. This is the result of a hardy blue-green algae that has a hardened black look over time. Mold should be tended to immediately.

How can I remove moss, mold, algae or lichen from my roof?

Your most common options are to either hire a professional roof cleaning contractor, power washer ("pressure washer") or DIY.

Let's talk about the first option. Hiring a professional roof cleaning contractor is the best option when you are not comfortable going up on your roof, inexperienced or you do not have the required tools and safety equipment needed to clean the roof safely and effectively. Most people fall into this camp because the majority of homeowners do not have the capability of cleaning their roof the way a contractor would. Using a pressure washer, low-pressure, will deliver the best moss, mold, algae and lichen removal results but a pressure wand in inexperienced hands can cause serious problems to a roof so consider this valid concern. Before hiring a professional to clean your roof, there are questions you'll want to be prepared to ask. See below.

The DIY option is twofold. We have customers who do many of their own household repairs, including cleaning their own roof. These customers tend to be handy, experienced with other large-scale home improvements. Having a walk-able roof is often the case here, in which case they rent or already have a pressure washer to do the cleaning. Then there is the most common homeowner approach, which is a spray and leave on "let Mother Nature" do the work cleaning where Roof Wash is applied in the Fall and goes to work throughout the Fall and Winter and results are seen in the Spring. This method requires patience but it's popular if you're looking for a DIY method and hiring a professional is not a viable economic option. It's also used as a maintenance method for people who want to stay on top of roof cleaning to ensure it doesn't require drastic measure down the road.

Can you clean a roof with bleach? How to clean a roof with bleach?

We strongly caution against the use of bleach to clean roofs and home exteriors. In fact, one of the main reasons Wash Safe™ formulas were invented was to address the problem of how to clean a roof without the use of toxic chemicals. Instead of sharing how to clean a roof, we're going to include below the top reasons you should never clean a roof using bleach.


Over-spray kills plants and trees and it’s dangerous for pets.

When a pressure washer comes to your home, the intention is that the cleaning solution will only be sprayed on your home. Often, this is not the case and over-spray happens and it can kill plants and trees

Bleach will not solve a moss, mold or algae problem long term.

It only makes it translucent by bleaching the stain out. Come next blooming season (usually in the spring) and the homeowner will have to call the roof cleaning company (that uses bleach) again. This happens continuously every 2-3 years. It’s a vicious cycle that feeds off a homeowner’s checkbook while damaging the surrounding landscaping.

Concentrated chlorine such as bleach will destroy plants and the network of life they depend on.

This network provides nutrients and communication plants need to thrive. We saw this video recently and thought it did an amazing job in visually articulating the network of plant life and how our seemingly small decisions and actions have larger consequences.

Bleach can unexpectedly wreak havoc on other parts of your home.

Aside from plants, using bleach on the roof can ruin other parts of the home if the run off if it is not caught by gutters. It can also leave streak marks on the roof where it has discolored shingles.

Bleach is harmful to birds, bees and other wildlife around your home.

If you have your roof washed with a bleach solution, you’ll soon see how effectively it ruins the ecological balance around your home. What a human can smell for a week, the wildlife can smell for a month. Nature is a good thing…. so just say “NO TO BLEACH”.

What is the best cleaner for cleaning asphalt roof shingles?

Roof, Cleaning, Roof Wash, Wash Safe, How to Clean Your Roof, Moss, Asphalt, Mold, Algae, Moss, Stains, Roof Cleaning Estimates, Cleaner
Roof, Cleaning, Roof Wash, Wash Safe, How to Clean Your Roof, Moss, Asphalt, Mold, Algae, Moss, Stains, Roof Cleaning Estimates, Cleaner
Roof, Cleaning, Roof Wash, Wash Safe, How to Clean Your Roof, Moss, Asphalt, Mold, Algae, Moss, Stains, Roof Cleaning Estimates, Cleaner
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Roof, Cleaning, Roof Wash, Wash Safe, How to Clean Your Roof, Moss, Asphalt, Mold, Algae, Moss, Stains, Roof Cleaning Estimates, Cleaner
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Roof, Cleaning, Roof Wash, Wash Safe, How to Clean Your Roof, Moss, Asphalt, Mold, Algae, Moss, Stains, Roof Cleaning Estimates, Cleaner
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Our mission is to provide the world's best and most environmentally conscientious formula to clean your roof. Our Roof Wash is ideal for cleaning and removing stains from moss, mildew, lichen or black algae on roofing shingles including asphalt, metal, tile, wood shake and rubber roofs. It's an oxygen-based cleaner made to remove dirt, debris and stains from moss, mold, algae and lichen. The oxygen-based formula is safe and effective with an active life of only 4-6 short hours before it biodegrades, making it the safest in the industry.  

Do you sell roof cleaning products in bulk or by the pallet?

Yes, Wash Safe™ offers discounts to contractors through our PRO Program as well as discounts on all pressure washing chemicals ordered by the pallet. Email to request PRO Program pricing materials.

How do I know how much roof cleaning product I need?

The way our roof cleaning formula works is for every pound of product used, you will yield up to 1,000 square feet of surface area cleaned. You will increase the product concentration for more dirty, built-up surfaces.


3 LB Roof Wash

up to 3,000 square feet

12 gallons of solution

10 LB Roof Wash

up to 10,000 square feet

40 gallons of solution

40 LB Roof Wash

up to 40,000 square feet

160 gallons of solution

When is the best time of day to clean my roof?

Morning or afternoon is the best time of day to clean your roof. When cleaning your roof, it is best to avoid high heat in the middle of the day.

When is the best time of year to clean my roof?

The best time of the year to clean your roof will vary with every situation. No two roofs are identical and every situation will be different. It depends on what your case. Sometimes an insurance company will demand a roof is cleaned within a number of days or a homeowner is looking to prepare a home for a sale. In these cases, as soon as possible. Otherwise, Spring through Fall works for a total cleaning and Fall is best for a "Maintenance" cleaning. We'll explain the maintenance cleaning more below.



Moss, mold, algae and other fungi; it can destroy a roof. Why is it there? Today's roof shingles have ingredients that provide food as well as water and air supply to these organisms so they are not just surviving — they are thriving, feeding off your roof and turning it into a live fungus garden! Is it destructive? It's ugly. It devalues your home. It lifts shingles which leads to leaks and loss; ultimately shortening the life of your roof. The answer is a resounding yes! As a homeowner, you need to take a proactive strategy to caring for one of your largest investments by cleaning and maintaining your roof. Cleaning your roof can be a hard to solve project but we're going to show you how it can be done safely and effectively using Roof Wash.


Roof, Cleaning, Roof Wash, Wash Safe, How to Clean Your Roof, Moss, Asphalt, Mold, Algae, Moss, Stains, Roof Cleaning Estimates, Cleaner



5 gallong mixing bucket for pressure washing





See how much solution your job requires. Wash Safe's Roof Cleaning calculator is coming soon! Check back foe developments soon!


Use 1/2 cup per gallon of water. Double the strength to remove tough stains.



UP TO 3,000 SQ FT



UP TO 10,000 SQ FT



UP TO 40,000 SQ FT



Use extreme caution cleaning your roof. Be careful on ladders and steer clear of electrical wires. If you are not skilled, comfortable or physically able, contact a professional.

Cover and avoid contact with windows, glass and raw metals (copper and aluminum) when spraying. It's best to rinse windows down before and after every cleaning application to avoid run off.

Avoid contact with eyes and prolonged skin contact. Keep out of reach o children and pets. Do not ingest. If swallowed, drink water and seek immediate medical attention.

Step 1: Coat roof with Roof Wash

The goal is to coat your roof with Roof Wash, which is not an easy task and can be quite dangerous. The safest way to do this is to use some type of pump to spray your roof. If your roof area is walk-able then a garden-style pump sprayer may be all that is needed - however, a steep roof must be sprayed from the ladder. The safest way to do this is to lean a ladder up on your roof above the gutter line. Be sure to use a ladder stabilizer to prevent the ladder from sliding along the gutter! This is the best spot to spray from.

how to pressure wash and clean asphalt and tile roof shingles


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How to Clean Your Deck with Deck Wash

In this video, Redihan shows you how to clean your wood deck using Wash Safe Deck Wash. Watch as it removes stains fom mold, akgae and other grime that are deep set within the porous wood.

How to Clean Your Roof with Roof Wash

Don't mind the cheesy music.. Redihan shows you how easy it is to clean your roof using Wash Safe's best selling Roof Wash. Watch as stains from black mold are rinsed away revealing even better curb appeal.

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