This is not just a cosmetic concern.
White growing chimney attic.
And the rh from the grow tent air is very likely to get stuck with this heat and cause mold on the attic.
The following getting rid of mold cleanup methods are recommended by epa and all of them can be applied in the attic assuming that it is a small area up to 10 sq.
Flue gases and sparks can enter the building.
The white material which appears on brick is a powdery mass of minerals called efflorescence.
The stains tell us that water has been entering the flue raising an alert for frost damage.
What is that white stuff on my chimney.
It is important to notice stains on a chimney exterior surface.
As attic is venting air from the whole house including kitchen there is always some heat in there.
To solve the issue you can reroute it to a vent which is going out of your attic.
Stains from water creosote or soot leaking out of a chimney such as in this attic.