06-02-2016, 08:30 AM
The black sounds like sooty mold, usually from scale, whitefly or aphids. can be washed off & neem soap or any botanical soap or oil-soap is usually good for both the sooty mold (actually a fungus) and the scale, whitefly or aphids
No need to keep the fungus on the shower tree & it can harbor moisture
No need to keep the fungus on the shower tree & it can harbor moisture