Most of the houses I've washed that were dryvit I've washed them by ds'ing 12.5 % sc and dawn. It usually cuts through the black and green mold very nicely followed up by a light rinse to remove the dead mold residue. This house was not real bad but it was dryvit with foam moldings around the window sills, trim and garage doors. Even the wedges under the gutter were made of foam.
41608 003 (Small).jpg
41608 026 (Small).jpg