Cleaning a Fabric or rubber roof

I have a client that has an older home that has what appears as a roof that has a material stretched over the roof. The roof is covered in black growth and is located in Florida. Can I use a Soft Wash cleaning solution on this type of roof?

I am a new member and the system will not let me upload a photo for your reference.

RV’s have the same issue and their industry vendors have specific products to address it.