Wet and Forget Mold and Mildew Stain Remover Review

Wet and Forget Mold and Mildew Stain Remover is a concentrated bleach-free and non-acidic product that works with rain, wind, and other elements to slowly remove stains from mold, mildew, algae and moss. It is one of the top products in the Wet and Forget company line which includes an indoor spray and forget product, a shower specific cleaner and a spider killer called Miss Muffet’s Revenge.



Wet and Forget 10587 1 Gallon Moss
Wet and Forget
Wet & Forget Mold and Mildew Stain Remover
1 gallon makes 6 gallons of ready to use product Covers approximately 750-2250 square feet depending on the porosity of the surface Non-caustic, Non-acidic, Contains no bleach No scrubbing or rinsing required

The Basics

Diluted with water and added to a spray applicator bottle, the concentrated formula can be used on virtually any outdoor surface to remove active moss and algae growth as well as stains from mold and mildew. This is a slower acting product which can take weeks to months to get results. It is EPA registered and is safe around plants and landscaping when used as directed. This product should not be used in or around lakes, rivers or other public sources of water.

The Wet and Forget company does offer a hose-end sprayer bottle as well as hose attachments to make using this product even easier. Each 1-gallon bottle will make 6 gallons and will treat around 1200 square feet when used as directed.

How to Use Wet and Forget Mold and Mildew Stain Remover

Wet and Forget 10587 1 Gallon Moss

In addition to clearly written instructions on the label, the Wet and Forget company has a number of informative videos on their website that will answer most questions. Using a pump type sprayer or sprayer with a hose attachment, you simply spray the diluted product on to the area that needs to be treated. The dilution ratio is 1:5 or 1 part Wet and Forget Mold and Mildew Stain Remover to 5 parts water. The exact amounts that you will need will depend on the size of the sprayer that you are using. There is a video on the website that breaks down amounts and gives additional filling instructions.

You do not need to brush or pre-treat the area first, although some people have said they had better results when doing so.

The application should be done early in the morning on a day with mild temperatures and no chance of rain for at least 4 hours after the product has been used. For areas with extreme stains, for instance, from black mold, it is advised to use a second application about one month after the first.

To treat moss the product should be applied directly to the moss and down to the surface it is growing on. The moss will begin to die off and then will be washed from the surface by the rain. For faster and more effective treatment, you can remove as much of the moss as possible by shoveling or cutting it off, being careful not to damage the surface underneath.

For surfaces that are vertical or are more protected from rain and wind, it may be necessary to start by using a wire brush and garden hose to clear as much of the stain or materials as possible before proceeding with the application process. Wet and Forget Mold and Mildew Stain Remover can also be used to help prevent stains from returning especially, in areas that are prone to mold or mildew such as shaded areas.

What Can Wet and Forget Mold and Mildew Stain Remover be Used To Clean?

This product can be used on a wide range of outdoor surfaces including on and around your home, your boat and your deck. It can be used on vinyl, wood or aluminum siding, concrete, treated wood decks and patios, brick, stone pavers and walkways, PVC, plastic, metal, outdoor carpeting, and outdoor furniture. This product will not cause damage to most materials, including those that are more delicate or older materials. It should not cause pitting, rusting or other types of damage in most metals. It should be noted that some metals are more resistant to the types of growth that Wet and Forget Mold and Mildew Stain Remover is designed to remove, so it would not be as useful on those surfaces.

When used on boat hulls or accessories, it should be done while the boat is off the water. This product should not be used inside of the house. Even when used outdoors, some people complain of an odor and/or fumes from this product. People with breathing issues or sensitivity of any kind may want to wear a face mask while applying this product.

Be Safe With Wet and Forget Mold and Mildew Stain Remover

In addition to breathing precautions such as using a mask, it is essential not to allow children or pets to come in contact with this product until it has dried. It usually takes around 5 hours. Once it is dry, it is safe to walk on once again.

The Wet and Forget company also warns people about using their products on roofs. It is essential to follow all safety guidelines regarding ladders to prevent serious injury. You may also note that mildew, mold and other growth may mean that your roof has some structural damage which could give way if you were to walk on it. If you have any fears of this being the case, do not use this product but immediately call for a roof inspection.

Is this a recommended product?

If you are looking for immediate or even fast results, this is not the product for you as most will not see changes of any kind for several days to months for most types of stains. On the other hand, if you are okay with being patient and just want a product that is easy to use with minimal effort required, Wet and Forget Mold and Mildew Stain Remover could be what you are looking for. It is safe to use even in areas where the liquid could come in contact with plants and does not contain bleach or acids.

It is highly recommended that you opt for the sprayer attachment bottle if you do not already own a pump sprayer to apply this product. There is some conflict here as the company sells a hose end style applicator bottle but suggests that you cannot use other hose end style sprayers as it dilutes the product too much and will make it less effective. The company does have a satisfaction guarantee that will reimburse for almost 2 full bottles of the Mold and Mildew Stain Remover.

  • Easy to use, no scrubbing needed.
  • Bleach free, non-acidic, non-foaming.
  • Will not harm surrounding plants when used as directed.
  • Can be used on a wide range of materials and surfaces including vertical surfaces.
  • Works with the elements including rain and wind.
  • Can be used as a preventative measure after initial use.
  • Stable, indefinite shelf life.
  • Concentrated formula makes a total of 6 gallons.
  • Will remove moss and algae growths as well as mold and mildew stains.
  • Can be used on boats and marine equipment as well.
  • Very slow process which can take weeks or months for results.
  • May need second or third applications to be truly effective.
  • Some surfaces will be more difficult to clean and may not get the type of results that are desired.
  • Some people report that the landscaping plants around a treated area were affected despite using the product as directed.
  • While this product is listed for “boat and marine use” it is also recommended that it not be used within 100 feet of water especially public waterways including lakes, rivers and streams.


For people who need immediate stain treatment, this is not the product of choice. However, for those who want the ease of a spray and walk away product that works over time, Wet and Forget Mold and Mildew Stain Remover might be the perfect answer. Whether it is mossy stones, algae on your boat hull or mildew stains on the porch that are the problem, the simple solution of Wet and Forget could help.

While it is not a super fast-acting product, it does save money overall even if repeated applications are needed. A single, one gallon bottle makes roughly 6 gallons of diluted solution to treat just over 1200 square feet. If you only have one or two areas that need to be treated, Wet and Forget Mold and Mildew Stain Remover could last several years. It has a stable, unlimited shelf life so there are no worries that it will be less effective years from the original date of purchase.

All instructions, including how to dilute the product and fill the sprayer as well as what types of sprayers will work best are clearly listed on the label. Additional information is also available on the Wet and Forget website through blogs and related videos. Wet and Forget Mold and Mildew Stain Remover can be used on nearly any surface and for most organic/plant matter related stains. The longer the stain has been there or the thicker the growth is, the longer it may take to work. The company is very receptive and responsive to questions, comments and concerns including via email, and on their website.

Whether it is for your home, patio, driveway, walkways or your boat, Wet and Forget Mold and Mildew Stain Remover can be used to spray and walk away black, brown or green stains. Mold and mildew, algae, moss and other invasive plants can cause serious damage if they are left untreated not to mention how unsightly the stains can be. Mildew stains especially can also have an odor that can make your outdoor areas less pleasant to be around.

The Wet and Forget company does offer a satisfaction guarantee on this and other products. Unused or unopened bottles of the Mold and Mildew Stain Remover or other products can be returned for a full refund within 30 days of the original purchase date. However, the company will give a full refund for up to 10 gallons (slightly less than 2 bottles) for up to 180 days after the original date of purchase if the product has failed to meet minimum standards of effectiveness.

It may take some time but that is the benefit of this product. You simply wet down the area and then leave it to the elements. The rain and wind will work to destroy the stains as well as the organic matter that is growing, and you only have to have the patience to allow the process to work, no other effort is needed. There are enough hard tasks in life, it's good to have something that is simple and easy to use that does the work for you.

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