An elderly family friend has a 3200 Sqft house. She states every time she has someone wash it her patio ceiling black mold comes back within two months, which may or may not be true. I have attached some pics. It appears to me that maybe the guys washing previously only used high pressure water???
Being that the ceiling front and back is going to be the hard part, I am thinking of some roof snot/cling-on to help get the chems to stick to the ceiling for awhile. Any recommendations for a mixture other than a stronger HW and let soak in? Percarbonate or Ox? It is painted white but the mold has definitely penetrated and there is no UV that hits it. Straight up embedded mold form years and years.
She is at her wits end paying guys when she says it never works. Any assistance so I can help an old friend would be great. The rest of the house is straight forward and I’ll just water down the plants a bit since its overgrown next to the house.
I am down streaming with a 10:1 injector with 12.5% and Gain. HW varies between 3:2 and 4:1 SH/H20 depending on application with this injector.