Zillow Advice: Home Improvement - How to remove black streaks from shingles? http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ Zillow Advice | Zillow Real Estate The shingle manufactures ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ The shingle manufactures recommend periodic cleaning with a no pressure, no wand &nbsp;process that will eradicate the infestation of GM, roof&nbsp;algae&nbsp;is caused the limestone filler in the shingles. You see it mostly on the north facing because the UV rays will keep it in check.<br/><br/>It is not acid rain, it is not pollution, it's spores that are growing.<br/><br/>We belong to a RCIA and the senior&nbsp;member's&nbsp;are certified in the removal of those ugly stains, most offer a warranty.<br/><br/>Never use acid on a&nbsp;asphalt&nbsp;shingle, only if you have rust stains, and then be very, very careful. I would not advise any DIY with roof cleaning.&nbsp;<br/><br/> Thu, 07 Feb 2013 12:59:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2013-02-07T12:59:00Z Black streaks are caused ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ Black streaks are caused by Gloeocapsa Magma feeding of of the limestone <br/>filler. A non pressure delivery system is the only way to clean a roof. NO PRESSURE!! [hotlink and phone removed by Zillow moderator] Fri, 08 Jul 2011 01:28:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2011-07-08T01:28:00Z If you were to search for ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ If you were to search for [link removed by moderator] you may find my company, pressurePros, Inc. We clean roofs professionally. Some interesting answers here. those streaks are a cyanobacteria called Gloeocapsa Magma. They cannot be pressure washed away. A treatment with a potent fungicide is the only good course of action. No more pressure than what comes from a garden hose should be used to rinse a roof. Mon, 01 Nov 2010 04:52:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2010-11-01T04:52:00Z PLEASE dont try to pressure ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ PLEASE dont try to pressure wash your roof!&nbsp; You will most likely damage the shingles rather then clean them.&nbsp; I see many stained roofs in the northeast and most dont appear to be damaged. Several people have had good luck with simple "house wash" products. Nothing works perfectly!&nbsp; I might suggest searching the roofing manufacturers web sites and those of building and roofing associations. Good Luck! Thu, 09 Apr 2009 21:37:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2009-04-09T21:37:00Z 2000 psi will take the coating ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ <p>2000 psi will take the coating right off the shingles.</p> Sun, 11 May 2008 23:27:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2008-05-11T23:27:00Z The water is not what I am ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ <p>The water is not what I am worried about.&nbsp; It rains on my roof all the time.&nbsp;&nbsp;&nbsp;&nbsp; :&gt;)<br/>It&rsquo;s the 2000 PSI that worries me!</p> Sun, 11 May 2008 00:56:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2008-05-11T00:56:00Z The acid protector sounds ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ <p>The acid protector sounds good. But I agree, pressure wash is a no-no. It's adding water to a water-caused problem.</p> Sat, 10 May 2008 15:39:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2008-05-10T15:39:00Z I live in Florida, house ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ <p>I live in Florida, house facing north, roof is shingle 6 years old. I also have wide black streaks,started after the 03 hurricaines.&nbsp; I was told it could be cleaned but would shorten the life of the roof...</p> Sat, 10 May 2008 15:11:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2008-05-10T15:11:00Z &nbsp;&nbsp;&nbsp; I have ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ <p>&nbsp;&nbsp;&nbsp; I have a customer that is a large roofing contractor&nbsp; and I asked him the question.&nbsp; He said there are types of acids that you can use to greatly reduce the staining but do NOT pressure was asphalt shingles ever.&nbsp;&nbsp; His comment to me is that&nbsp;a good pressure washer will turn a 20 year shingle into a 10 year shingle in a hurry.</p> Sat, 10 May 2008 03:07:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2008-05-10T03:07:00Z Someone told me that they ... http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ <p>Someone told me that they used a pressure washer to remove the marks on their roof. &nbsp;I don&rsquo;t know if this is a good idea. Has anyone else heard of doing this?</p> Fri, 09 May 2008 23:22:00 GMT http://www.zillow.com/advice-thread/How-to-remove-black-streaks-from-shingles/31991/ 2008-05-09T23:22:00Z