How do I clean mold from a leaky ICF foundation?
My last place I built my shop with icf, 1 wall is 11’ below grade, I used foundation drains and back filled with river rock, this is on a very steep hill and below the shop we have a French drain in front of the entire house , these drains flow an amazing amount of water , the 4” pipe full flow after a day or so of rain. So if you can dig it out and add drains then backfill with rock there will be nothing to hold the water on the wall then the drain will remove the water. I have used this process on many houses with sub grade walls and only 1 ever needed additional sealing and it was cinder block. 
Providing the water a path that doesn’t hold water and getting rid of the water at the bottom usually works well. Then there is no moisture to create the mold. I use 3% hydrogen peroxide and water to kill mold it works really well and doesn’t stink.