I have tried to clean sunbrella awnings with significant dirt/mold and it has not done well. More recently I have seen it on patio furniture. It does not do well either. I have had some success with Sporicidin Mold and Mildew Remover. I have used regular upholstery detergents and HWE when cleaning.
Part of the issue is the client waiting too long to call because they think it will clean well.
Eric
And to add to that, the material is porous, and the mold growth happens INSIDE the stuffing of any outdoor upholsteryā¦
So, you are treating it topically, but will NEVER be able to get the black mold (often years of neglect) out of said furnitureā¦.
Iāve often seen the client use a pressure washer or other method to ācleanā things, and do NOT dry them, the issues get worse, then they call out of desperation.
It then becomes our problemā¦