This is one I did a year ago. It was greyed and covered in algae and lichen. I cleaned it, and sprayed it with the customer supplied stain.
The middle section in the first picture is after cleaning, but before I went around and got the lichen off the bottom 2 rows. The second picture is after cleaning and staining. I was happy with my first attempt, and the customer loved it, which is what matters in the end.
Unfortunately, these are my only pictures. This is the roof I fell off of. After I returned to work a week later, I just wanted to get it done. Didn't bother with more pics.
tha looks great,now can you use apple sauce mix to clean wood type roof,the reason i ask alot of people want to say that bleach will dry out there roof,i am not trying to do that!thanks
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Bayou Power Washing & Roof Cleaning  318-614-0108
No it won't dry out asphalt shingles. But I don't recommend it for wood. It softens the fibers too much degrading it's integrity and it also bleaches out the natural color of the wood.
Oxalic acid is the answer Wolman sells a Oxalic acid cleaner made just for this called Wolman® Deck & Fence Brightener and they are great company that really know their stuff!!
ehow says to use any generic brightner, many contain bleach derivitaves so I don't beleive them either. Redwood should be done with Oxalic acid as well.
-- Edited by Baltimore MD Roof Cleaning 410-482-4367 at 19:06, 2009-03-04
Oxalic Acid is all I have ever used years ago on shingle roofs. When I started in 1986 I used Oxalic acid an Alkota 2800psi 4gpm hot water system, two ladders tied together on opposing sides of the roof and a tree arborist rope and sling set up. I have since improved my safety standards and cleaning methods.  I would then apply CFW as a sealer (pre voc compliance days this was my go to sealer). Over the past two decades cedar roofs have become few and far between in VA. replaced by asphalt, slate, and composite shingles. I have not cleaned a cedar roof in a good 10 years. The one ongoing problem I had was with the roofing nails used while installing cedar shingles over time would back out, be hard to see and slice gauges on my legs, arms and hind quarters sometimes requiring stitches. The demand is low in Richmond to clean cedar shake roofs. Other wise I would be more intune and upto date on proper cleaning methods for wood shake shingles.    Â
we have leads for cedar shake, I'm just not that interested. The customer never wants to pay the large amount $2500-4000. It's also easy to break shingles when you walk on them , thus having to replace and now you'll never get the continuity.
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Ryan Freidline A Team Roof Cleaning Northern Virginia 888.867.7615
Cedar is a business all it's own. Please be carefull if choosing to do cedar jobs for the first time. Consult the PWI for info on how to clean cedar, and practice on some pine first. Doing this will save you loads of headaches.