A house I purchased had huge trees over half the house and parts of the roof hardly saw sunshine for a long time. I since cut the trees down so the roof now gets some sun (Indirect since its on the back of the house). There are some dark stains and old blue/dried moss or algae. What's the best method of giving the roof a gentle cleaning? Its an older shingle roof, I would say I will probably replace it in another 5-7 years or so. So just something to help clean it up a bit, without ruining it.
I've used Wet&Forget on my last house and I'm still not so sure how well it worked overall. That product works slow over time. I can get up there and use this, but I wanted to ask what else others are using to give the roof a cleaning without being too rough.
I've seen all sorts of recommendations from diluting bleach, to products, to sprinkling zinc and other methods. I know a copper/zinc strip installed at the top will help keep things at bay, but since the roof now isn't covered in trees I don't think I'll have much of a problem after I get the old stuff off.
No I would never power wash a roof so that's out of the question. I will go up with the hose and spray on whatever needs to go on, or use a light brush in any stubborn areas.
The front of the house has a hard pitch but it looks great up there, no issues at all. Its only the back side, and I can easily get up there and walk around so I can do whatever I need up with ease.
Hit me with your best tips to give this roof a cleaning.