Which is better, wet and forget or spray and forget?

Author: Ruby Cassin  |  Last update: Wednesday, January 14, 2026

The main difference between Benzalkonium Chloride and Sodium Hypochlorite is on how fast they work. Benzalkonium Chloride in Wet and Forget has a long-term cleaning method, whereas the Sodium Hypochlorite in 30 Seconds Spray and Walk Away has a fast reaction for immediate results.

What is the problem with Wet and Forget?

Wet & Forget is highly corrosive, and can seriously harm your skin or eyes.

What is better than Wet and Forget?

Bio-Shield® is Proven Effective

Bio-Shield will give a powerful, rapid kill of moss, fungal, algal and lichen growths, and can prevent re-growths. It can be used to clean any exterior surface.

Do you need to rinse off Wet and Forget?

Spring. Apply Wet & Forget Outdoor as soon as the weather warms to remove unsightly stains and growth that have been hiding in winter. Spring rain showers work with the product to clean dirty outdoor surfaces for you – no rinsing or scrubbing required!

Does spray and forget really work?

It really does do what it claims. The drawback is it takes weeks to months of direct weather exposure to work. I didn't use it on my RV roof because I kept it under cover. If it was stored outside I might have been tempted to try it. It doesn't really remove imbedded dirt but it does work great on algae and mildew.

Wet And Forget Best Cleaner Ever? Honest Review

Is there a difference between Wet and Forget and spray and forget?

The main difference between Benzalkonium Chloride and Sodium Hypochlorite is on how fast they work. Benzalkonium Chloride in Wet and Forget has a long-term cleaning method, whereas the Sodium Hypochlorite in 30 Seconds Spray and Walk Away has a fast reaction for immediate results.

How long does it take to see results from Wet and Forget?

For mild contaminations, results can be seen in days. For more stubborn infestations Wet & Forget can take approximately 2-3 months to see improvements. In very severe cases of contamination it may take 6-12 months to work.

What if it rains after applying Wet and Forget?

Thoroughly saturate the surface with Wet & Forget Outdoor. Then, allow the product to dry. Wet & Forget will work over time with the rain and wind to gently clean up the green and black stains.

Do you pressure wash before Wet and Forget?

It's not necessary to clean the surface before application. Apply Wet & Forget to a dry surface. Can I apply Wet & Forget with a hose end sprayer or a pressure washer? We recommend applying Wet & Forget with a pump-up garden sprayer, backpack sprayer or a low-pressure agricultural sprayer.

Does Wet and Forget damage plants?

Wet & Forget is non-systemic; therefore, if there is runoff into the garden beds, it will not be absorbed into the root system and will not damage plants at all. Wet & Forget won't affect plants unless you accidentally spray directly onto them, which can cause spot burning of the leaves.

What can you use instead of Wet and Forget?

Bio-Shield kills moss, fungus, algal and lichen growths quickly and effectively. It may be used to clean any outdoor surface. The correct application of Bio-Shield® is easy, it just requires the surface that is being treated to be saturated and kept wet until the moss. mould and lichen are dead.

Why was Wet and Forget recalled?

Hazard: The hose end nozzle clip can dislodge and allow the cleaning solution to spray on users, posing a risk of skin and eye irritation and other injuries.

What is the main ingredient in Wet and Forget?

Lastly, the details: the active ingredient in Wet and Forget is alkyldimethylbenzyl ammonium chloride. Do YOU know what that is, how it works, what it's doing to our environment, or how quickly it degrades?

What is the caution for Wet and Forget?

P280 - Wear protective gloves, protective clothing & eye protection. GHS Precaution Phrases: P305+351+338 - IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do.

Does Wet and Forget damage shingles?

Wet & Forget's gentle, caustic formula is safe for all shingles and won't corrode your downspouts or harm your lawn with runoff.

What is the difference between wet and forget and wet and forget rapid?

About the product differences:

Does Rapid Application cover less of an area than the original 5L Wet & forget concentrate? No, the 2L Rapid Application and the 5L Wet & Forget concentrate cover the exact same area, it is just the dilution rates that are different. They both cover a minimum of 100sq metres.

How to remove algae without scrubbing?

Determine how severe the algae or other biological growth is. For heavy soiling, dilute 2 parts water to 1 part GK Greener Kleener. For light to medium soiling dilute 3 parts water to 1 part GK Greener Kleener. Easily apply the formula to the affected area using a garden sprayer or a brush.

How long does it take for Wet and Forget to start working?

How long will Wet & Forget Outdoor take to work? It depends on the type of growth and the intensity of the contamination. If it's a new growth or a small amount of staining you can see results within days. Otherwise, it may take 2-3 months to see improvement.

Does Wet and Forget really work?

I used Wet and Forget as directed and it worked its miracles, just as described on TV. At first, it looks pretty ugly if your moss is on cement because everything turns brown. But then the moss disappears - and it stays gone. I also used it on some rubber outdoor mats with similar results.

Will Wet and Forget damage paint?

Will Wet & Forget Outdoor interfere with paint, stain, or seal coating products? No, Wet & Forget Outdoor doesn't contain any bleach and is non-acidic, so it will not harm or discolor new paint, stain, or seal coat finishes.

What are the dangers of Wet and Forget?

H302 - Harmful if swallowed. H314 - Causes severe skin burns and eye damage. H319 - Causes serious eye irritation. P260 - Do not breathe mist/vapours/spray.

What happens if it doesn't rain after applying Wet and Forget?

Just thoroughly wet the DRY surface with Wet & ForgetⓇ and then forget about it. The elements (wind and rain etc) will slowly wash off the stain. If the surface to be treated is not fully exposed to rainfall or is vertical, some assistance may be required to remove the stains.

Does Wet and Forget need sun to work?

Surfaces that are treated with Wet & Forget need exposure to the sun and rain to properly clean the surface. We'd suggest rinsing down the cushions weekly to simulate rain one time per week until the cushions are clean.

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