D/2 Biological Solution Stone Cleaner - 0.946L (1 US Quart), Removes Mold, Algae, Lichen From Masonry

D/2 is a popular cleaner for removing ugly biological stains like mold, algae, mildew, and lichen from stone, masonry, and wood.

It's biodegradable, pH neutral, and contains no acids or chlorine, so it's safe to use around plants and won't etch surfaces.

You apply it full strength, let it sit for 10-15 minutes, scrub with a soft brush, and rinse.

For lighter jobs, you can even use a \no scrub\ method – just spray it on and let weather do the work over a few weeks.

Great for cleaning headstones, patios, statues, siding, or concrete.

One quart covers a decent area.

Used by professionals and homeowners alike because it works without being too harsh.