If it's actually moss you need to scrape it off. If
you mean algae then the best method is strong
ammonia solution and a scrub brush. (Moss has
height. It's a recognizable plant. It will occasionally
grow near the ground on siding. Algae shows as a
green stain. It can build up fairly thick, but appears
as a coating rather than stems and leaves.)
Bleach will work, but not as well as ammonia. Bleach
is also more damaging to both the siding and your
You might have good luck hosing it down, but it's
hard to get algae off without a scrub brush. The
ammonia turns it to mush but then it needs to be
loosened. If there's too much to scrub you might
try wetting it with ammonia so that it's well soaked
for a few minutes, then try a powerwash fitting
to wash it off.
If you actually have mildew (blackish spots)
that requires bleach.
| Live outside of Boston.
| Typical Colonial, with white painted clapboards.
| Lots of big, green, what I will call Moss (but may be wrong term for),
| spotted areas on one side of house.
| Really don't want to re-paint the house at this time.
| Is there any "good" product that I can perhaps attach to my hose and
| just spray the "Moss" ? Would it kill it ? Just remove it ?
| It is way too high up for me to consider getting up there and doing any
| hand scraping, etc. Would have to be from ground level.
| Would be concerned about the safety of the product in that it doesn't do
| any additional discoloring of the white paint, or cause peeling.
| What about "Pressure Washing":
| Something to consider ? Just water, or some mixture ?
| Would be very worried about pressure washing causing peeling of the
| paint; house hasn't been painted in a very long time.
| Product to use or other opinions ?
| Any thoughts on any, or all, of this would be most appreciated.
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