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Don't pressurewash your roof!!
If you've got regular shingles on your roof, pressurewashing will take off 50% of the granules in the shingles, therefore wearing them out and making their life-expectancy shorter. We bought a house a couple years ago and the previous owners said they recently within the past 2 years put on a new roof. Well, when we got the house inspected, the inspector noticed that half of the granules were missing and some shingles were loose. He said that only happens when it is pressurewashed.
Who knows, it could also be cheap shingles, but it's not smart to pressure-wash. If you got moss on your roof, you should sprinkle it with Tide before it rains so it loosens the moss so that you can brush it off. (Tide also works on shaded driveways.)
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