To avoid streaks start cleaning at the bottom edge of the roof and work your way up rinsing frequently with lots of fresh water.
Roof cleaning zinc.
Zinc strips can be somewhat effective at controlling moss growth.
Zinc being a heavy metal is highly toxic to plants as the metal leaches away it kills the mold and gloeocapsa magma roof algae that are responsible for the black streaks roof stains.
Upon request many cleaners can apply zinc strips or anti growth sprays to protect a roof until the next cleaning.
Zinc strips work by slowly releasing zinc particles when rain water hits the strips.
Even though zinc is a organic natural element zinc ions released by zinc strips is a highly toxic chemical to plants and fish.
There are several different ways to apply the cleaning chemicals to the roof and each has their pro s and con s.
These services cost extra.
The use of zinc strips zinc sulfate zinc chloride copper sulfate and potassium are other chemicals are widely used to clean roofs and keep them clean for many years.
Liquidzinc works the same way that zincshield works by coating the roof with zinc ions that keeps the roof clean free of stains algae moss lichen and mildew.
Roof cleaning chemicals why not zinc strips.
Also consider that using acidic substances like lemon juice and vinegar will remove the patina on your zinc objects which might not be desirable depending on the look you are going for.
Other chemical ways to clean a roof zinc and potassium.
Most cleaners charge under 50 per zinc strip plus installation for example.
The principle behind zinc roof strips can be seen on a stained roof just below the metal roof vents where typically the roof algae is not present in a 24 inch high pyramid pattern with the tip of the pyramid being the vent.
In short zinc strips are made of a toxic heavy metal and science is learning more about the dangers of this poisonous chemical.
Liquidzinc is a color free zinc ion rich formula developed to meet common situations that we have encountered.
The most common and environmentally friendly methods to clean zinc involve using lemon juice vinegar toothpaste or baking soda.
Spray this mixture onto the roof and agitate it with a soft bristled brush to get it clean.