forum thread Posted by phoinix | Staff • 6d ago
May 12, 2025 7:22 AM
Item 1 of 1
forum thread Posted by phoinix | Staff • 6d ago
May 12, 2025 7:22 AM
$29.99: 48-Oz Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover Multi-Surface Cleaner at Amazon
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Came in to say the same thing. We are in NC and got quite some mold on the house siding. I didn't even wash. Literally wet and forget. Worked very well. Now I apply once a year. Some other moldy houses in the neighborhood apparently haven't found this thing 😀
Just FYI, costco also has this.
Ready-to-use: 1.65% alkyl dimethyl benzyl ammonium chloride
1 Gallon Concentrate: 9.9%, to be mixed with 5 gallons of water to produce a 1.65% mix
Hose end: 30% concentrate - infers that this makes 6.8 gallons at 1.65% ready-to-use concentration
This should make 6.8 gallons total mix if you prefer to use a sprayer.
It's a shame since this used to be ~$17/gal for the concentrate a couple years ago at Lowe's and WalMart (currently $28.12, or 6% more per finished gallon if you don't mind doing the math). The active chemical, after a bit of sleuthing, really is a algicide, but the specific formation is not divulged (only the general alkyl dimethyl benzyl ammonium chloride) The base chemical has multiple variants which target difference algae cell wall types, so you can't just grab a generic form and expect it to work similarly.