I've got algae growing on my vinyl siding (only on certain areas) and its
either bright green or dark green, but I need to clean it off.
Conventional wisdom is to do it with high pressure water and I could pay
a guy to do it, or buy my own 'unit' and do it myself.
Question: there is a range of units from cheap/low pressure (i.e. 1100
lbs specified) on up to expensive (and gas engine)/high pressure (i.e.
2000+ lbs as specified) and my question is: do you really need that
higher pressure? Is there a kind of threshold where below the threshold,
you get significantly less cleaning performance?
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Get a siding cleaner that kills mold first , you really wont get rid of
it with a power washer . It will grow right back as you didn't change
anything affecting growth, or its roots. you probably wont need a
powerwasher with a few applications. Bleach works but i don't know what
it will do to vynal . 1200 lb are good just slower.
I live in Houston, a swamp of algae and mildew, so my 'new' house has some
algae on the bricks. I wanted to try chemical removal first before pressure
washing. I'm not certain if bleach will have any effect on algae (as it does
on mildew). I browsed at Lowe's and found several spray-on cleaners for
houses. Then I found this stuff at Ace Hardware: www.sprayandforget.com
specifically for algae. It was expensive per gallon but it seems to work
well at killing the stuff, plus it leaves a residue that keeps the stuff
from growing back. It doesn't have the immediate effect that power washing
would but then power washing can damage siding, etc.
I've never faced this problem, but our local paper carries a column by a
home inspector with a couple of decades' of experience. He points out that
since you'll be power washing from ground level, you'll be forcing water
BEHIND the siding. Proceed at your own peril.
You seldom have a use for the high pressures you get from the big gasoline
units but if you use a softer nozzle you get a much wider spread at a more
reasonable pressure and things go a lot faster. I have a 1200 electric unit and
access to a 6500 gasoline unit. If I have a big job I use the big one. The
electric is small and easy for small jobs.
On 06 Jul 2004 15:46:41 GMT, email@example.com (Greg) wrote:
A follow up question, if I may.
I have a large pecan tree in my back yard that needs spraying with
fungicide/pesticide. My hand sprayer won't reach high enough so I
need to know if a high pressure washer will do the job.
Like Doug said:
If you are going to use a power washer, do it from ABOVE the siding. Now I
know that may sound difficult, and you may have to do it from a ladder, but
if you do it from ground level and spray UPWARDS, you are going to get water
BEHIND the vinyl and then you are in for big trouble. Whatever is behind it
will stay soggy and rot. Then dirty siding will be the least of your
It's amazing to me that this isn't completely obvious to anyone considering
power washing. I have immense respect for the guy on our local radio show
for keeping his language civilized when callers ask about the procedure. :-)
I had a bunch of algae? Mildew? Green on the joists to a porch.
Hit it with "jet" on the hose to get the gross dirt/dust of, then
1/2C bleach in a couple gallons of water with a bristle brush (small
broom) and about 20 minutes (with a yellow rubber rain jacket on after
the first minute :) )
Is it a LARGE area you need to clean? Out of reach of a broom?
3rd cheap option: Hit any rental place and rent one for a day.
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